Our Opinion

The Samsung Galaxy A51 (6GB RAM) is a significantly better phone, but the Xiaomi Redmi Note 9 (4GB RAM, 64GB) is significantly better value for money. Which phone should you buy? Depends on how much you want to spend! But if budget is not a constraint then we recommend the Samsung Galaxy A51 (6GB RAM)

Samsung Galaxy A51 (6GB RAM)  Xiaomi Redmi Note 9 (4GB RAM, 64GB) 
Samsung Galaxy A51 Xiaomi Redmi Note 9
Buy Now Buy Buy
Excellence Score
41.4
35.2
Value for Money Score
62.0
83.2
Price ₹ 22,998 onwards ₹ 11,499 onwards
Launch Date (India) Jan, 2020 Jul, 2020
Expected Launch Date N/A N/A
Smartphone OS Android 10Expected update to next Android version Android 10Expected update to next Android version
Touchscreen Yes (Capacitive) Yes (Capacitive)
Screen Size 6.5 inches 6.53 inches
Screen Resolution 1080x2400 pixels (~ 405 pixels per inch) 1080x2340 pixels (~ 395 pixels per inch)
Tall Aspect Ratio / Minimal Bezels Yes Yes
Scratch Resistant Display Yes, Corning Gorilla Glass 3 Yes, Corning Gorilla Glass 5
Display Type AMOLED IPS LCD
Screen Refresh Rate 60 HzStandard 60 HzStandard
Display Features Super AMOLED Sunshine mode, Night mode, Colour temperature adjustment, Anti-oil and anti-fingerprint protective coating
Full Physical QWERTY Keypad
Processor 2.3 GHz 2 GHz
Processor Type Octa Core Octa Core
Processor Name Samsung Exynos 9611Ranked #37 in Mobile Processor Benchmarks MediaTek Helio G85Ranked #33 in Mobile Processor Benchmarks
GPU Mali-G72 MP3 Mali-G52 MC2
RAM 6 GB 4 GB
3G Yes Yes
4G Yes Yes
5G
VoLTE Yes Yes
WiFi Yes Yes
VoWiFi/WiFi-Calling Yes Yes
GPS Yes Yes
Bluetooth Yes Yes
Connecting Port USB-C USB-C
Primary Camera 48MP + 12MP + 5MP + 5MP 48MP + 8MP + 2MP + 2MP
Camera Auto-Focus Yes Yes
Camera Flash Yes Yes
HD Video Recording Yes (Full HD) Yes (Full HD)
Other Camera Features 48MP: f/2.0 Aperture; 1/2" Sensor Size; 0.8um Pixel Size; PDAF, 12MP: f/2.2 Aperture; 13mm Focal Length (Ultra-wide), 5MP: f/2.4 Aperture; Dedicated Macro camera, 5MP: f/2.2 Aperture; Depth sensor, Panorama, HDR 48MP: f/1.8 aperture; 1/2.25" Sensor Size; 0.8um Pixel Size; PDAF, 8MP: f/2.2 aperture; 119° Field-of-view; 13mm Focal Length; Ultra-wide; 1/4.0" Sensor Size; 1.12um Pixel Size, 2MP: f/2.4 aperture; Macro Lens; 1/5.0" Sensor Size; 1.75um Pixel Size, 2MP: f/2.4 aperture; Depth Sensor, HDR, Panorama, Video: [email protected]; [email protected]/60/120fps; [email protected], EIS, Ultra Nightscape mode, AI scene detection, Smart ultra-wide angle mode, Ultra wide-angle edge distortion correction, AI Beautify, Burst mode, Tilt-shift, Level display, Custom watermark, Pro mode, Portrait mode background blur adjustment, Studio Lighting, Panorama mode, AI high resolution photos
Secondary Camera 32MP 13MP
Secondary Camera Features f/2.2 Aperture, 26mm Focal Length, 1/2.8" Sensor Size, 0.8um Pixel Size, HDR Panorama selfie, Palm shutter, AI silhouette detection, Wide-angle distortion correction, HDR, Selfie timer, Face recognition, Age recognition, AI Beautify, AI feature adjustment, AI makeup, AI portrait mode, AI scene detection, AI studio lighting
Internal Memory 128 GB 64 GB
Expandable Memory Slot Yes, up to 512 GB Yes, up to 512 GB
Contacts Storage Unlimited Unlimited
SMS Storage Unlimited Unlimited
Music Player Yes Yes
FM Radio Yes Yes
Dual SIM GSM+GSM GSM+GSM
Thickness 7.9 mmMedium 8.9 mmMedium
Weight 172 gmMedium 199 gmHeavy
Width 73.6 mmOk for one-handed use 77.2 mmInconvenient for one-handed use
Audio Output 3.5mm jack 3.5mm jack
Water Resistant Yes, Splash Resistant (P2i Coating)
Battery Capacity 4000 mAh 5020 mAh
Battery Standby N/A N/A
Battery Standby (3G) N/A N/A
Battery Talktime N/A N/A
Battery Talktime (3G) N/A N/A
Fast Charging Support Yes, 15W Fast Charging Yes, 18W Fast Charging
Included Fast Charger Yes, 15.0W Fast Charger Yes, 22.5W Fast Charger
Other Battery Parameters N/A N/A
Fingerprint sensor Yes Yes
Other Features In-display fingerprint sensor; NFC; ANT+ Support; Noise Filtration; Dolby Atmos 9W Reverse Charging; Noise Filtration
2-minute Review [Positives]
  • Stunning looks, similar rainbow-like effects at the back as the Galaxy A50s when caught against the light, and a prism-like pattern that Samsung calls a “3D prism design” - it's a head-turner no doubt
  • While it supports a polycarbonate back, it still manages to look premium
  • The front looks stylish and modern too with a single punch-hole in the upper middle of the display
  • Compact and light for the display size and battery capacity, at just 172g, and 7.9mm in thickness
  • Bright, large 6.5-inches Super AMOLED panel with a full-HD+ resolution - its punchy colours make it a joy to stream content, while games also look great on the panel because of its high colour accuracy
  • There's Widevine L1 support by default, which makes streaming content in HD possible
  • Comes with Android 10 out of the box - Samsung's One UI 2 is now one of the better, more clean and streamlined Android UIs around, and is well optimised for modern large displays (like this one)
  • Samsung has also added some neat features including a Game Booster and an intuitive gesture-based navigation system
  • Decent performance with the same Exynos 9611 processor as the Galaxy A50s (similar to Qualcomm Snapdragon 660/665) - the experience is fairly smooth throughout with games like PUBG Mobile and Asphalt 9
  • Decent quad camera setup at the back - a 48MP primary sensor + 12MP wide-angle camera + 5MP macro camera + 5MP depth sensor
  • Under good light, the Galaxy A51's primary camera managed to capture detailed shots with good dynamic range - images are reasonably sharp, noise is also competently removed, colours are generally nice, and the phone strikes a good balance with saturation
  • The ultra wide-angle cam is a significant upgrade from the one on the A50s, and it offers improved sharpness and detail - dynamic range is also substantially better, making for an altogether pretty capable ultra-wide camera as far as mid-rangers go
  • Macro camera turns out quite good close ups - you can get a lot closer to your subject when using the macro camera and the sensor picks up a fair bit of detail
  • Very good portrait mode ("Live focus") - image quality is good and the depth camera helps the Galaxy A51 do a decent job of edge detection
  • The front 32MP camera is decent and produces nice colours, the detail is quite good as far as selfie cameras go - portrait selfie mode is decent too
  • Decent video recording from both primary and wide cameras with dedicated 'super steady' mode which allows you to shoot decent “action” videos (though stabilisation is not available at 4K)
  • Decent bottom-firing speaker - sufficient for personal listening
  • Solid, dependent battery life from the 4000 mah battery - will easily manage to get a day and a half's worth of regular use
  • Reasonable 15W fast charging - charges 67 percent in an hour (though, not as quick as others in this segment such as the Redmi K20 Pro)
  • Overall, a decent and likeable smartphone from Samsung - offers a polished experience, a slim and light body, solid battery life, a crisp display, and of course the Samsung brand (though, the performance at this price is a letdown)
  • Fresh, bright and vibrant design, with a gleaming, reflective rear panel - the design here is very similar to that of the Note 9 Pro’s with the back is now made of polycarbonate
  • The distinctive camera bump design plays into the theme of symmetry - this is a beautiful design touch that sets the Redmi Note 9 series apart and makes this phone and its siblings recognisable
  • The front of the phone looks modern and defies expectations for its price category - the hole-punch is now on the left unlike the other 2 Note phones that have it in the center
  • Fingerprint sensor is moved to the back, and it is swift at unlocking the phone
  • Xiaomi's trademark infrared emitter is on the top and can be used to control several home appliances
  • Crisp, vivid and bright 6.53-inch IPS display with a tall aspect ratio - the panel delivers punchy and vibrant colours and the large screen work nicely for consuming videos and games
  • The display also gets sufficiently bright for outdoors use
  • MIUI is one of the more refined and smooth Android skins around, and has a lot of customisation/theming options - there are ample features for power users - from gestures to the ability to switch around button layouts as well as a robust home screen customisation experience, you can make the phone your own
  • Good performance for the price powered by the respectable new MediaTek G85 SOC - the day-to-day tasks on the Redmi Note 9 feel light and effortless and it can run heavy 3D games like PUBG at low or medium settings
  • Decent quad cameras for the price - a 48MP primary shooter, an 8MP ultra-wide-angle lens, a 5MP macro camera and a 2MP depth sensor
  • In daylight, the primary camera takes reasonably good shots - Xiaomi has opted for a very natural-looking colour science, the colour temperature and white balance are spot-on which is very good to see, and the dynamic range isn't too bad either (though, there is a certain softness to images, which can be fixed with a software update)
  • The ultra-wide-angle mode works well to capture a wide frame without much effort, and the quality is decent
  • Xiaomi has done a particularly good job at optimising the portrait mode, and the phone does a fantastic job at edge-detection, creating a natural-looking blur
  • The macro camera delivers good quality shots than from most other 2MP macro cameras because of the autofocus
  • The 13MP front camera is fairly good in the daytime as well as at night - details are crisp, and portrait shots have nicely blurred backgrounds, which can be pre-adjusted
  • Very good battery life with the 5020 mAh battery - with ordinary use, the Redmi Note 9 easily lasts through a full day and nearly half of the second day before needing a recharge
  • Decent fast charging with the 18W fast charger in the box, takes nearly 2 hours to fill the phone (though this isn't the fastest charging phone and the Realme 6i's 30W charging is much better)
2-minute Review [Negatives]
  • The in-display fingerprint sensor as well as the facial recognition are on the slower side
  • The glossy body is prone to picking up fingerprints
  • There's still some bloatware pre-installed, including third-party apps and some of Samsung's own apps such as Samsung Shop (though most of them can be uninstalled)
  • At this price, the performance feels weak - there are cheaper phones that offer much better performance, like the Redmi K20 & the Realme X2
  • Low light photos out of the Galaxy A51 aren't great (from all cameras) - The output is soft and noisy, while the colours are relatively desaturated
  • Overall, while the Galaxy A51 offers good cameras, there are certainly better options available, such as the Redmi K20 Pro
  • However, as far the value for money goes, the Galaxy A51 is far behind from the competition - there are better options like the Redmi K20 Pro which gets you a flagship-grade processor, an HDR display, more premium materials, and even better cameras - in fact, for a bit less money, you could also get the Redmi K20, which is also very capable
  • At 8.9mm thick and 199g in weight, the Redmi Note 9 is a bit bulky and unwieldy
  • It continues to pack a lot of bloat though - you get many pre-installed applications with wide-ranging requirements for user permissions
  • The gaming performance is a downgrade from other Note 9 series phones, you'd be better off with phones like Redmi Note 9 Pro or Redmi 6i if you want a phone for heavy gaming
  • Low light photography is average, images are grainy with digital artefacts and splotches creating a nearly unusable shot
  • Overall, this is not the best camera setup at this price and this time Realme has done a better job which with its Realme 6i which offer better cameras at this price
  • The Realme 6i out-specs the Redmi Note 9 at every corner, be it high refresh-rate 90Hz display panel, or the supported faster 30W charging as well as the much better MediaTek G90T SOC, at just marginally higher price - Realme 6i is an all-round better deal
Expert Reviews
  1. If you absolutely must have a Samsung, this one isn't bad to spend the brand-related premium on... but there are better options available
    gsmarena.com in-depth Read Review »
  2. A nice-looking phone that offers a beautiful AMOLED display, very good battery life, and we don’t mind the plastic build at all... but the performance is underwhelming
    phonearena.com in-depth Read Review »
  3. Galaxy A51 packs a great screen, a handful of cameras, and a big battery... but it's not a consistent performer
    engadget.com in-depth Read Review »
  4. The Galaxy A51 appeals to those looking for a polished experience, a slim and light body, solid battery life, a crisp display, and of course the Samsung brand... but a more powerful processor at this price would be preferred
    gadgets.ndtv.com in-depth Read Review »
  5. The Galaxy A51 gets few things right like the great display, versatile camera setup, sleek design, and slim form factor... but it does not pack the power, considering its price point
    fonearena.com in-depth Read Review »
  6. There’s a lot to like including the Infinity-O display, stylish design as well as good cameras.
    indianexpress.com in-depth Read Review »
  7. Samsung Galaxy A51 has great design and display, decent cameras, reliable battery and Samsung's brand trust and loyalty... but performance could have been better
    ibtimes.co.in in-depth Read Review »
  8. A very respectable mid-range mobile
    stuff.tv in-depth Read Review »
  9. Offer a unique Samsung experience tailored to the next gen Indian buyer
    indiatoday.in in-depth Read Review »
  10. Buy it for daily tasks, and if you like the looks... ignore if you're looking for power
    firstpost.com in-depth Read Review »
  11. This is a phone that you could flaunt
    zeebiz.com in-depth Read Review »
  12. The Galaxy A51 is a mid-range smartphone that does a good job in all areas and takes good photos
    notebookcheck.net in-depth Read Review »
  13. If you aren't too bothered about gaming and just want a great everyday driver which is sleek and lasts through the day on a single charge, the Galaxy A51 will certainly not disappoint... but the overall performance is a bit of a letdown
    in.mashable.com in-depth Read Review »
  14. A mid-ranger with plenty of polish
    pocket-lint.com in-depth Read Review »
  15. androidauthority.com in-depth Read Review »
  16. digitaltrends.com in-depth Read Review »
  17. expertreviews.co.uk in-depth Read Review »
  18. gadgetsnow.com in-depth Read Review »
  19. techpp.com in-depth Read Review »
  20. deccanchronicle.com in-depth Read Review »
  21. techadvisor.co.uk in-depth Read Review »
  22. trustedreviews.com hands-on Read Review »
  23. themobileindian.com hands-on Read Review »
  1. Hard to recommend, because of the alternatives like the Realme 6i
    gsmarena.com in-depth Read Review »
  2. Decent value
    gadgets.ndtv.com in-depth Read Review »
  3. If you want to get a balanced performance for the price, the Redmi Note 9 is a good option, though better options exist
    bgr.in in-depth Read Review »
  4. A Note For The Not-So-Heavy Users
    in.mashable.com in-depth Read Review »
  5. indianexpress.com in-depth Read Review »
  6. news18.com in-depth Read Review »
  7. tech.hindustantimes.com in-depth Read Review »
  8. timesnownews.com in-depth Read Review »
  9. techpp.com in-depth Read Review »
  10. indiatoday.in in-depth Read Review »
  11. gadgetsnow.com in-depth Read Review »
  12. thenewsminute.com in-depth Read Review »
  13. firstpost.com in-depth Read Review »
User Reviews
  1. Flipkart4.4 877+ reviews »
  1. Flipkart4.4 477+ reviews »
Official Website Official Website » Official Website »
Unofficial specs? N/A N/A
Individual Review 2
  • Individual Review 2
Individual Review

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