Xiaomi Redmi Note 9S vs Oppo A91

Here we compared two mid-range smartphones: the 6.67-inch Xiaomi Redmi Note 9S (with Qualcomm Snapdragon 720G) that was released on March 23, 2020, against the Oppo A91, which is powered by MediaTek Helio P70 and came out 4 months before. On this page, you will find tests, full specs, strengths, and weaknesses of each of the gadgets.

Key differences

An overview of the main advantages of each smartphone
Reasons to consider the Xiaomi Redmi Note 9S
  • Comes with 995 mAh larger battery capacity: 5020 vs 4025 mAh
  • 48% better performance in AnTuTu Benchmark (335K versus 226K)
  • Newer Bluetooth version (v5)
  • Slow-motion recording at 960FPS
  • More recent OS version: Android 11 versus 9
  • Ability to record video in 4K resolution
  • More energy-efficient CPU – Snapdragon 720G
  • The front-facing camera can record video at 1080p
  • Has a built-in infrared port
Reasons to consider the Oppo A91
  • AMOLED display (versus competitor's IPS LCD)
  • Weighs 38 grams less
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Review

Display
Screen quality, color accuracy, brightness
Performance
CPU/GPU performance in apps and games
Battery
Battery life, charging type and speed
Camera
Photo and video recording quality
Connectivity
Networks, ports, data transmission
NanoReview score
Final comparison evaluation

Value for money

You can enter your local price of these phones (in USD or any other currency) and click on the "Calculate" button to see which one has a better value for money.
Price

Tests and specifications

Comparison table of technical specifications and tests

Display

Type IPS LCD AMOLED
Size 6.67 inches 6.4 inches
Resolution 1080 x 2400 pixels 1080 x 2400 pixels
Aspect ratio 20:9 20:9
PPI 395 ppi 408 ppi
Refresh rate 60 Hz 60 Hz
HDR support Yes, HDR10 No
Screen protection Corning Gorilla Glass 5 Corning Gorilla Glass 5
Screen-to-body ratio 84.5% 85.5%
Display features - - Always-On Display
Display tests
RGB color space 114.9% 100%
PWM Not detected 250 Hz
Response time 34 ms 3.2 ms
Contrast 1111:1 ∞ Infinity
Max. Brightness
577 nits
Oppo A91 +7%
617 nits
Sources: NotebookCheck [3], [4]

Design and build

Height 166 mm (6.54 inches) 160.2 mm (6.31 inches)
Width 77 mm (3.03 inches) 73.3 mm (2.89 inches)
Thickness 8.8 mm (0.35 inches) 7.9 mm (0.31 inches)
Weight 210 gramm (7.41 oz) 172 gramm (6.07 oz)
Waterproof No No
Rear material Glass Plastic
Frame material Plastic Plastic
Colors White, Black, Blue Black, Blue
Fingerprint scanner Yes, in home button Yes, in-display
Screen-to-body ratio
Oppo A91 +1%
85.5%

Performance

Tests of Xiaomi Redmi Note 9S and Oppo A91 in the benchmarks
SoC
Chipset Qualcomm Snapdragon 720G MediaTek Helio P70
Max. clock 2300 MHz 2100 MHz
CPU cores 8 (2 + 6) 8 (4 + 4)
Architecture - 6 cores at 1.8 GHz: Kryo 465 Silver (Cortex-A55)
- 2 cores at 2.3 GHz: Kryo 465 Gold (Cortex-A76)
- 4 cores at 2 GHz: Cortex-A53
- 4 cores at 2.1 GHz: Cortex-A73
L3 cache 1 MB -
Lithography process 8 nanometers 12 nanometers
Graphics Adreno 618 Mali-G72 MP3
GPU clock 750 MHz 900 MHz
FLOPS ~435 GFLOPS ~78.8 GFLOPS
Memory
RAM size 4, 6 GB 8 GB
Memory type LPDDR4X LPDDR4X
Memory clock 2133 MHz 1866 MHz
Channels 2 2
Storage
Storage size 64, 128 GB 128 GB
Storage type UFS 2.1 UFS 2.1
Memory card MicroSD MicroSD
Memory card max. size Up to 512 GB Up to 256 GB

Benchmarks

Geekbench 5 (Single-Core)
578
304
Geekbench 5 (Multi-Core)
1761
1454
AnTuTu Benchmark 9
335202
226510
CPU 103898 75732
GPU 84401 40738
Memory 54825 48848
UX 88784 59514
Total score 335202 226510
3DMark Wild Life Performance
784
721
Stability 97% 98%
Graphics test 4 FPS 4 FPS
Graphics score 784 721
PCMark 3.0 score 7973 6581
Sources: 3DMark [3], [4]

Software

Operating system Android 10.0 (Can be upgraded to Android 11) Android 9.0
ROM MIUI 12.5 ColorOS 6.1
OS size 18 GB 20 GB

Battery

Specifications
Capacity 5020 mAh 4025 mAh
Charge power 18 W 20 W
Battery type Li-Po Li-Po
Replaceable No No
Wireless charging No No
Reverse charging No No
Fast charging Yes (50% in 50 min) Yes, VOOC 3.0 (50% in 30 min)
Full charging time 2:30 hr 1:35 hr

Battery life tests

Web browsing (Wi-Fi)
19:12 hr
n/a
Watching videos (Player)
16:30 hr
n/a
Talk (3G)
41:30 hr
n/a

Camera

Specs and camera test of smartphones
Main camera
Matrix 48 megapixels 48 megapixels
Image resolution 8000 x 6000 8000 x 6000
Zoom Digital Digital
Flash LED Dual LED
Stabilization Digital Digital
8K video recording No No
4K video recording Up to 30FPS No
1080p video recording Up to 60FPS Up to 30FPS
Slow motion 960 FPS (1080p) 120 FPS (720p)
Angle of widest lens 119° 119°
Lenses 4 (48 MP + 8 MP + 5 MP + 2 MP) 4 (48 MP + 8 MP + 2 MP + 2 MP)
Wide (main) lens - 48 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2", Samsung S5KGM2 (ISOCELL CMOS)
- Phase autofocus
- 48 MP
- Aperture: f/1.8
- Focal length: 26 mm
- Pixel size: 0.8 micron
- Sensor: 1/2.0" (CMOS)
- Phase autofocus
Ultra-wide lens - 8 MP
- Aperture: f/2.2
- Focal length: 13 mm
- Pixel size: 1.12 micron
- Sensor: 1/4.0", Omnivision OV8856
- 8 MP
- Aperture: f/2.3
- Pixel size: 1.12 micron
- Sensor: 1/4.0" (CMOS)
Monochrome lens - - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- Sensor: 1/5.0" (CMOS)
Macro lens - 5 MP
- Aperture: f/2.4
- Pixel size: 1.12 micron
-
Depth lens - 2 MP
- Aperture: f/2.4
- Pixel size: 1.75 micron
- 2 MP
- Aperture: f/2.4
Camera features - Bokeh mode
- Pro mode
- Bokeh mode
- Pro mode
Selfie camera
Megapixels 16 megapixels 16 megapixels
Image resolution 4920 x 3264 4920 x 3264
Aperture f/2.5 f/2.0
Focal length - 26 mm
Pixel size 1 microns -
Sensor type CMOS CMOS
Sensor size 1/3.06" 1/3.06"
Video resolution 1080p (Full HD) at 30 FPS 720p at 30 FPS

Connectivity

Wi-Fi standard Wi-Fi 5 (802.11 b/g/n/ac) Wi-Fi 5 (802.11 a/b/g/n/ac)
Wi-Fi features - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
- Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5 4.2
Bluetooth features LE, HID, A2DP LE, A2DP
USB type USB Type-C USB Type-C
USB version 2 2
USB features - Charging
- USB-Storage mode
- OTG
- Charging
- USB-Storage mode
- OTG
GPS GPS, GLONASS, Beidou, Galileo, NAVIC GPS, GLONASS, Beidou, Galileo
NFC* No Yes
Infrared port Yes No
Network
Number of SIM* 2 2
Type of SIM card Nano Nano
Multi SIM mode Standby Standby
eSIM support* No No
Hybrid slot No No
LTE Cat* 12 7
5G support No No

Sound

Speakers Mono Mono
Headphone audio jack Yes Yes
FM radio Yes No
Dolby Atmos No No
Speakers test
Max. loudness
Oppo A91 +10%
88.9 dB

Other

Category Mid-range Mid-range
Announced March 2020 December 2019
Release date April 2020 June 2020
SAR (head) 0.72 W/kg -
SAR (body) 0.98 W/kg -
Sensors - Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
- Proximity sensor
- Gyroscope
- Accelerometer
- Ambient light sensor
- Compass
- Fingerprint
*Disclaimer! NFC, GSM network support, and some other specs can be different depending on the country.

Conclusion

After analyzing all the data, we think that the Xiaomi Redmi Note 9S is definitely a better buy.

Cast your vote

So, which phone would you choose?
14 (70%)
6 (30%)
Total votes: 20

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