Oppo F21 Pro vs vivo S9

Network
2G network

GSM 850, 900, 1800, 1900

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

HSDPA 850, 900, 2100

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

LTE frequency band 1, 3, 5, 8, 38, 40, 41

LTE frequency band 1, 3, 4, 5, 8, 28, 34, 38, 39, 40, 41
5G network

-

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

42.2 Mbps

42.2 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
LTE speed

LTE-A, 391 Mbps download, 150 Mbps upload

LTE-A
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Aluminium alloy, glass

Plastic, glass
SIM

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

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

159.9 mm

158.4 mm
Width

73.2 mm

73.9 mm
Thickness

7.5 mm

7.4 mm
Weight

175 g

173 g
Waterproof

IPX4

-
Dust proof

IPX4

-
Build features

RGB ring light around the camera (notifications, charging progress)

-
Colors

Black, Orange

Black, Blue, White

Display
Display type

AMOLED

AMOLED
Physical size

6.43 inches

6.44 inches
Resolution

1080 x 2400 pixels

1080 x 2400 pixels
Pixel density

409 ppi

409 ppi
Display colors

16777216

16777216
Protection

Corning Gorilla Glass 5

Scratch resistant, 2.5D curved glass screen
Display features

90Hz, 430 nits (typ), 600 nits (HBM), 800 nits (peak)

-

Main camera
Camera type

Triple

Triple
Main camera

(wide) , 64 MP, f/1.7 , 79˚ , 26 mm, 1/2.0" , 0.7 µm

(wide) , 64 MP, f/1.8 , 26 mm, 1/1.72" , 0.8 µm
(microscope) , 2 MP, f/3.3 , 65˚

(ultrawide) , 8 MP, f/2.2 , 120˚ , 16 mm, 1/4.0" , 1.12 µm
89˚ , (depth) , 2 MP, f/2.4 , 1.75 µm

(depth) , 2 MP, f/2.4
Primary camera resolution

9280 x 6920 pixels

9280 x 6920 pixels
Primary camera video

1080p@30fps, gyro-EIS

4K@30fps, 1080p@30fps, gyro-EIS
Primary camera flash

LED flash

dual-LED dual-tone flash
Camera features

Autofocus, continuous autofocus, continuous shooting, digital zoom, digital image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, macro-mode, phase detection autofocus, contrast detection autofocus

Autofocus, continuous shooting, digital 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

Selfie camera
Selfie camera type

Single

Dual
Selfie camera

(wide) , 32 MP, f/2.4 , 24 mm, 1/2.74" , 0.7 µm

(wide) , 44 MP, f/2.0
(ultrawide) , 8 MP, f/2.2 , 105˚
Selfie camera features

Face unlock, HDR

Face unlock, autofocus, HDR, face detection, panorama, geotagging, digital image stabilization
Selfie camera video

1080p@30fps, gyro-EIS

4K@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
WLAN WiFi Hotspot

Yes

Yes
WLAN WiFi Direct

Yes

Yes
WLAN WiFi Dual Band

Yes

Yes
USB

Type-C 2.0

Type-C 2.0
USB On-The-Go

Yes

Yes
Bluetooth

v5.1

v5.2
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
Bluetooth AptX

aptX HD

aptX HD
NFC

Yes

Yes
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

Yes
BDS

Yes

Yes
QZSS

Yes

-

Features
Sensors

Accelerometer, compass, fingerprint, gyroscope, proximity

Accelerometer, compass, fingerprint, gyroscope, proximity

Battery
Battery type

Li-Po

Li-Po
Battery capacity

4500 mAh

4000 mAh
Battery removable

Non-removable

Non-removable
Fast battery charging

SuperVOOC, 33W (100% in 60 min)

Vivo FlashCharge(66% in 30 min)
Reverse charging

Yes

-
Talk time 4G

-

17.6 h