Xiaomi Mi 9 SE vs Samsung Galaxy A51

$305.99 VIEW ON eBay
$299.91 VIEW ON eBay

Display

Size

6.0 inches
6.5 inches

Resolution

1080 x 2340 pixels, 19.5:9 ratio,
432 PPI
1080 x 2400 pixels, 20:9 ratio,
405 PPI

Technology

AMOLED
Super AMOLED

Screen-to-body

83.96 %
87.37 %

Features

HDR video support, Scratch-resistant glass (Corning Gorilla Glass), Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor

Hardware & Performance

System chip

Qualcomm Snapdragon 712 SDM712
Samsung Exynos 9611

Processor

Octa-core, 2300 MHz, Kryo 360, 64-bit, 10 nm
Octa-core, 2300 MHz, ARM Cortex-A73 and ARM Cortex-A53, 64-bit, 10 nm

GPU

Adreno 616
Mali-G72 MP3

RAM

6GB
4GB

Internal storage

128GB
128GB

Storage expansion

 
microSDXC up to 512 GB

OS

Android (9.0 Pie)
Android (10), Samsung One UI

Battery

Capacity

3070 mAh
4000 mAh

Type

Not user replaceable
Li - Polymer, Not user replaceable

Charging

 
Fast charging

Camera

Rear

Triple camera
Quad camera

Main camera

48 megapixels
48 megapixels

Features

Phase-detection autofocus
Phase-detection autofocus

Second camera

13 megapixels
12 megapixels

Features

Ultra-wide, Phase-detection autofocus
Ultra-wide

Third camera

8 megapixels
5 megapixels

Features

Telephoto, Autofocus
Macro

Fourth camera

 
5 megapixels

Features

 
Depth information

Video recording

3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (960 fps)
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (240 fps)

Features

Digital image stabilization, Video calling, Video sharing
Hyperlapse, Digital image stabilization

Front

20 megapixels
32 megapixels

Features

High Dynamic Range mode (HDR)
High Dynamic Range mode (HDR)

Design

Dimensions

5.81 x 2.78 x 0.29 inches (147.5 x 70.5 x 7.45 mm)
6.24 x 2.90 x 0.31 inches (158.5 x 73.6 x 7.9 mm)

Weight

5.47 oz (155 g)
the average is 6.2 oz (176 g)
6.07 oz (172 g)
the average is 6.2 oz (176 g)

Materials

 
Back: Plastic

Biometrics

2D Face unlock, In-screen fingerprint
2D Face unlock, In-screen fingerprint

Colors

Black, Purple, Blue
Prism Crush black, Prism Crush white, Prism Crush pink, Prism Crush blue

Cellular

LTE (FDD)

Bands 1(2100), 3(1800), 5(850), 7(2600), 8(900)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 17(700 b), 20(800 DD), 26(850+), 28(700 APT), 66(AWS-3)

LTE (TDD)

Bands 34(2000), 38(2600), 39(1900+), 40(2300), 41(2600+)
Bands 38(2600), 40(2300), 41(2600+)

UMTS

850, 900, 1900, 2100 MHz
850, 900, 1700/2100, 1900, 2100 MHz

Data Speed

LTE-A, HSPA, HSUPA
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

Dual SIM

Yes
Yes

SIM type

Nano SIM
Nano SIM

VoLTE

Yes
 

Multimedia

Headphones

No 3.5mm jack
3.5mm jack

Features

Album art cover, Background playback
Dolby Atmos

Connectivity & Features

Bluetooth

5.0
5.0

Wi-Fi

802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot

USB

Type-C (reversible), USB 2.0
Type-C (reversible), USB 2.0

Features

Mass storage device, Charging, Headphones port
Charging, OTG

Sensors

Accelerometer, Gyroscope, Compass
Accelerometer, Gyroscope, Compass

Other

NFC, Infrared, VoIP, Tethering, Computer sync, OTA sync
NFC, ANT+

Phone features

Notifications

Haptic feedback, Music ringtones, Vibration
 

Other features

Voice dialing, Voice commands, Voice recording
 
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