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Global Score
11.679.4
Basic Information
SamsungXiaomi
Android 11Android 11, 10
2021-01-292020-04-07
6.50 x 2.98 x 0.35 inches6.53 x 3.02 x 0.35 inches
8.04 ounces7.37 ounces
Phantom black and SilverAurora blue, Glacier white and Interstellar grey
Aluminum and Glass (Corning Gorilla Glass Victus)Glass (Corning Gorilla Glass 5)
Scratch-Resistant GlassScratch-Resistant Glass
$ 966.00$ 249.00
Display / Screen
6.8 inches6.7 inches
3200 x 1440 pixels 2400 x 1080 pixels
Dynamic AMOLED IPS LCD
516 pixels per inch393 pixels per inch
1500 cd/m2 brightness--
No touch screenNo touch screen
9.88
Performance
Qualcomm Snapdragon 888 chipsetQualcomm Snapdragon 720G SM7125 chipset
Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processorKryo 465, 64-bit, 8 nm (Octa-Core 2300 MHz) processor
12 GB RAM4 GB RAM
Adreno 660 GPUAdreno 618 GPU
9.729.27
Storage
128 GB internal memory64 GB internal memory
No SD card slotmicroSDXC (up to 512 GB) external memory slot
10.111.74
Camera
108.00 MP + 40.00 MP48.00 MP + 16.00 MP
f/1.80 aperturef/1.80 aperture
24.00mm focal length--
0.75 inches (1/1.33") sensor0.5 inches (1/2") sensor
7680 x 4320 (24 fps) video resolution3840 x 2160 (30 fps) (4K) video resolution
1280 x 720 (960 fps) (HD) slow motion video1280 x 720 (960 fps) (HD) slow motion video
13.7511.55
Networks
Wi-FiWi-Fi
Mobile HotspotMobile Hotspot
5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPALTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA
Nano SIMNano SIM, Dual SIM
10.76.7
Battery Life
5000mAh Li - Polymer Battery5020mAh Li - Polymer Battery
Non-Removable BatteryNon-Removable Battery
Wireless Charging--
4.965.28
Other Features
Bluetooth 5.1 Bluetooth 5.0
GPSGPS
NFC--
--Infra-red port
Fingerprint ID ScannerFingerprint ID Scanner
Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity SensorAccelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor
FM Radio--

Comparison review

The Galaxy S21 Ultra is a lot better than the Xiaomi Redmi Note 9S, getting a 11.67 score against 9.4. Both of these phones work with the same Android 11 OS (operating system), so they should give all the same operating system features. The Galaxy S21 Ultra is a just a bit heavier cellphone than Xiaomi Redmi Note 9S, but both have the same thickness.

The Galaxy S21 Ultra has a much sharper screen than Xiaomi Redmi Note 9S, because it has a better pixel density, a higher 1440 x 3200 resolution and a quite bigger screen. Galaxy S21 Ultra counts with a little faster processing unit than Xiaomi Redmi Note 9S, and although they both have the same number of cores, the Galaxy S21 Ultra also has 8 GB more RAM.

Xiaomi Redmi Note 9S has more storage capacity for games and applications than Samsung Galaxy S21 Ultra, because although it has less internal memory capacity, it also counts with a slot for an SD memory card that holds a maximum of 512 GB. Galaxy S21 Ultra shoots much clearer photographs and videos than Xiaomi Redmi Note 9S, and although they both have a same size aperture, the Galaxy S21 Ultra also has a lot better video resolution, a back camera with lot more megapixels and a lot bigger camera sensor which provides a way higher image and video quality.

The Xiaomi Redmi Note 9S has a bit superior battery life than Samsung Galaxy S21 Ultra, because it has a 0% more battery capacity.

Although Galaxy S21 Ultra is a better device, it costs a lot more money than the Xiaomi Redmi Note 9S, and it doesn't have such a good relation between it's price and quality as Xiaomi Redmi Note 9S. If you are trying to save some money, you can buy the Xiaomi Redmi Note 9S, giving up a couple features, but you will get the most out of your savings.