Difference between XIAOMI MI 9 and OPPO WATCH 2 ?

	PRODUCT 1	PRODUCT 2
	XIAOMI XIAOMI MI 9	OPPO OPPO WATCH 2
VERSION
Announced	2019	July 2021
Release date	2019	July 2021
NETWORK
Technology		Wifi or 4G & Wifi
DEVICE
Dimensions	157.5 x 74.7 x 7.6 mm
Weight	173 g
S.I.M.	Double SIM	eSIM
Design	20MP
Other	DCI-P3 - HDR10	water resistant/resistant to water
SCREEN
langfront.Type		AMOLED
Size	6.39 inches	1.91 inches
Resolution	1080 x 2340 pixels	402 x 476 pixels
Protection	Gorilla Glass 6
PLATFORM
Operating system	Android 9.0 (Pie); MIUI 10	Android Wear OS
Chipset	Qualcomm SDM855 Snapdragon 855 (7nm)	Qualcomm Snapdragon Wear 4100 (12nm)
Processor	Octa-core (1x2.84 GHz Kryo 485 & 3x2.42 GHz Kryo 485 & 4x1.8 GHz Kryo 485)	Quad-core 1.7 GHz Cortex-A53
GPU	Adreno 640	Adreno 504
MEMORY
Card slot	❌	❌
Internal & RAM	64/128 GB, 6/8 GB RAM	8GB 1GB RAM
CAMERA
Main	48 MP + 12 MP + 16 MP	❌
SOUND
Loudspeaker	✔️	✔️
Jack 3,5 mm	❌	❌
CONNECTIVITY
Wifi	✔️	✔️
Bluetooth	✔️	✔️
GPS	✔️	✔️
NFC	✔️	✔️
Radio	❌	❌
USB	2.0,Type-C 1.0,	❌
CHARACTERISTICS
Sensors	Fingerprint (under display),accelerometer,gyroscope,proximity,compass,infrared port,	Accelerometer,gyro,heart rate,compass,barometer,SpO2 / Accelerometer,gyroscope,cardiac frequency,compass,barometer,SpO2,
Various	27W Fast Battery Charging - 20W Wireless Fast Charging
BATTERY
Type	3300 mAh	510 mAh

What is the difference between XIAOMI MI 9 and OPPO WATCH 2 ?