Oppo A91 vs Xiaomi Mix 4

Network
2G network

GSM 850, 900, 1800, 1900; CDMA 800 & TD-SCDMA

GSM 850, 900, 1800, 1900; CDMA 800
3G network

HSDPA 850, 1700(AWS), 1900, 2100

HSDPA 850, 900, 1700(AWS), 1900, 2100; CDMA2000 1xEV-DO
4G network

LTE frequency band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 34, 38, 39, 40, 41, 42
5G network

-

5G band 1, 3, 5, 8, 28, 41, 77, 78, 79 SA/NSA/Sub6
HSDPA speed

42.2 Mbps

42.2 Mbps
HSUPA speed

11.5 Mbps

5.76 Mbps
LTE speed

LTE-A

LTE-A, 1174 Mbps download, 210 Mbps upload
GPRS

Yes

Yes
EDGE

Yes

Class 8

Design
Build

Aluminium alloy, glass

Glass front (Gorilla Glass Victus), ceramic back, aluminum frame
SIM

Dual SIM (Nano-SIM, dual stand-by)

Dual SIM (Nano-SIM, dual stand-by)
Height

160.2 mm

162.6 mm
Width

73.3 mm

75.4 mm
Thickness

7.9 mm

8 mm
Weight

172 g

225 g
Splash resistant

-

IP53
Dust proof

-

IP53
Colors

Dark blue, Blue, Red

Black, Gray, White

Display
Display type

AMOLED capacitive touchscreen

AMOLED
Physical size

6.4 inches

6.67 inches
Resolution

1080 x 2400 pixels

1080 x 2400 pixels
Pixel density

411 ppi

395 ppi
Display colors

16777216

1073741824
Protection

Scratch resistant

Scratch resistant, 3D curved glass screen, Corning Gorilla Glass Victus
Multitouch

Yes

-
Display features

-

120Hz, HDR10+, Dolby Vision, 800 nits (HBM), Wide color gamut, True-tone

Main camera
Camera type

Quad

Triple
Main camera

48 MP, f/1.8 , 26 mm, 1/2.0" , 0.8 µm

108 MP, f/1.9 , 24 mm, 1/1.33" , 0.8 µm, (wide)
8 MP, f/2.2 , 13 mm, 1/4.0" , 1.12 µm

8 MP, f/4.1 , 120 mm, (periscope telephoto) , 5x optical zoom
2 MP, f/2.4 , 1/5" , 1.75 µm

13 MP, f/2.2 , 1/3.06" , 1.12 µm, 123˚ , (ultrawide) , 12 mm
2 MP, f/2.4 , 1/5" , 1.75 µm
Primary camera resolution

8000 x 6000 pixels

-
Primary camera video

2160p@30fps

8K@24fps, 4K@30/60fps, 1080p@30/60/120/480fps; gyro-EIS, HDR10+
Primary camera flash

LED flash

dual-LED flash
Camera features

Autofocus, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, macro mode, phase detection autofocus

Autofocus, continuous shooting, digital zoom, optical zoom, digital image stabilization, optical image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, phase detection autofocus, laser autofocus, AI 2.0, night mode 2.0, stagger HDR

Selfie camera
Selfie camera type

-

Single
Selfie camera

16 MP, f/2 , 26 mm, 1/3.1" , 1.0 µm

20 MP, 27 mm, 1/3.4" , 0.8 µm, (wide)
Selfie camera resolution

4608 x 3456 pixels

5184 x 3880 pixels
Selfie camera features

-

Face unlock, HDR
Selfie camera video

1080p@30fps

1080p@30fps

Connectivity
WLAN

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5Ghz, 802.11ac

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5GHz, 802.11ac, 802.11ax
WLAN WiFi Hotspot

Yes

Yes
WLAN WiFi Direct

Yes

Yes
Wi-Fi display

Yes

-
WLAN WiFi Dual Band

Yes

Yes
USB

Type-C 1.0 reversible connector

Type-C 2.0
USB On-The-Go

Yes

-
Bluetooth

v5.0

v5.2
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
Bluetooth AptX

-

aptX HD
Infrared

-

Yes
NFC

-

Yes
GPS

Yes, with A-GPS

Yes, with dual-band A-GPS
GLONASS

Yes

Yes
Beidou

Yes

-
BDS

-

Yes
QZSS

-

Yes
NavIC

-

Yes

Features
Sensors

Accelerometer, compass, fingerprint, gyroscope, proximity, light

Accelerometer, color spectrum, compass, fingerprint, gyroscope, proximity

Battery
Battery type

Li-Po

Li-Po
Battery capacity

4025 mAh

4500 mAh
Battery removable

Non-removable

Non-removable
Fast battery charging

VOOC Flash Charge 4.0 (50% in 30 min)

Quick Charge 4 (100% in 15 min)
Fast wireless charging

-

Yes (100% in 28 min)