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Amazfit T-Rex 3 vs Samsung Galaxy Watch8 Classic

Physical
Case diameter — —
Case thickness — —
Weight 68.3 g —
Case material — —
Bezel material — —
Lens / crystal — —
Strap material — —
Strap width — —
Colors available — —
Water resistance — —
Military standard — —
Display
Display type — —
Display diagonal — —
Resolution width 480 px —
Resolution height 480 px —
Touchscreen Yes No
Always-on display No No
Max brightness — —
Battery
Smartwatch mode 648 h —
GPS-only mode — —
All-systems GPS mode — —
Max battery saver mode 180 h —
Charging type Magnetic charging base —
Solar charging No No
Wireless charging No No
Positioning
GNSS systems GPS —
Multi-band / dual-frequency Yes No
Offline maps Yes No
Built-in maps No No
Turn-by-turn navigation No No
Sensors
Optical heart rate Yes Yes
ECG No No
SpO2 / pulse oximeter Yes No
Skin temperature No No
Accelerometer No No
Gyroscope No No
Compass No No
Barometric altimeter No No
Ambient thermometer No No
Microphone No No
Speaker No No
Connectivity
Bluetooth No No
Wi-Fi Yes Yes
NFC payments No No
Cellular / LTE No Yes
ANT+ No No
Music storage No No
Third-party apps No No
Satellite communication No No
Health & Fitness
Sleep tracking Yes No
Stress tracking Yes No
HRV tracking No No
Training load Yes No
Training readiness / recovery Yes No
VO2 max estimate No No
Running dynamics No No
Body battery / energy score No No
Menstrual cycle tracking No No
Fall / incident detection No No
Guided workouts No No
Multisport / triathlon mode Yes No
Software
Operating system — —
Companion app — —
Voice assistant — —
Contactless payments No No