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Amazfit T-Rex 3 vs Garmin Cirqa Smart Band

Physical
Case diameter — 27 mm
Case thickness — 9 mm
Weight 68.3 g 14.8 g
Case material — Polymer
Bezel material — —
Lens / crystal — —
Strap material — fabric (ComfortFit bands)
Strap width — —
Colors available — —
Water resistance — 50 m
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 Garmin proprietary plug charger
Solar charging No No
Wireless charging No No
Positioning
GNSS systems GPS 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 Yes
Skin temperature No Yes
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 No
NFC payments No No
Cellular / LTE No No
ANT+ No Yes
Music storage No No
Third-party apps No No
Satellite communication No No
Health & Fitness
Sleep tracking Yes Yes
Stress tracking Yes Yes
HRV tracking No Yes
Training load Yes Yes
Training readiness / recovery Yes Yes
VO2 max estimate No Yes
Running dynamics No No
Body battery / energy score No Yes
Menstrual cycle tracking No Yes
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