What are the differences between the Xiaomi Smart Band 9/NFC and the Xiaomi Smart Band 8/NFC?

The differences between them are as follows:
CategoryXiaomi Smart Band 9Xiaomi Smart Band 9 NFCXiaomi Smart Band 8Xiaomi Smart Band 8 NFC
Auto BrightnessSupportSupportSupportSupport
APP BindingMi FitnessMi FitnessMi FitnessMi Fitness
Bluetooth VersionBT5.4 dual-mode BluetoothBT5.4 dual-mode BluetoothBluetooth 5.1 BLEBluetooth 5.1 BLE
Battery Life Performance
(typical usage)		Typical usage mode: 18 days;
AOD: 8 days		Typical usage mode: 18 days;
AOD: 8 days		Typical usage mode: 16 days;
AOD: 6 days		Typical usage mode: 16 days;
AOD: 6 days
NFCNot supportSupportNot supportSupport
Sports Modes159 types159 types159 types159 types
Running CoursesSupportSupportSupportSupport
Vitality ScoreSupportSupportSupportSupport
Pebble ModeSupportSupportSupportSupport
Necklace ModeSupportSupportSupportSupport
WidgetsSupportSupportSupportSupport
Motion-sensing Interactive CoursesSupportSupportSupportSupport
Interconnectivity
(fitness equipment linkage, sports data casting, treadmill connectivity, quick pairing, mirror settings, reading efficiency)		SupportSupportSupportSupport

Does it help?

Yes
No