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Fitbit Air vs Garmin Descent Mk3 (43mm)

Physical
Case diameter — 43 mm
Case thickness — 14.15 mm
Weight — 53.5 g
Case material — Stainless steel
Bezel material — Stainless steel
Lens / crystal — sapphire crystal
Strap material — silicone
Strap width — —
Colors available — —
Water resistance — 200 m
Military standard — —
Display
Display type — AMOLED
Display diagonal — 1.2 mm
Resolution width — 390 px
Resolution height — 390 px
Touchscreen No No
Always-on display No No
Max brightness — —
Battery
Smartwatch mode — 240 h
GPS-only mode — —
All-systems GPS mode — —
Max battery saver mode — —
Charging type — Garmin proprietary clip charger
Solar charging No No
Wireless charging No No
Positioning
GNSS systems — —
Multi-band / dual-frequency No Yes
Offline maps No No
Built-in maps No Yes
Turn-by-turn navigation No No
Sensors
Optical heart rate No Yes
ECG No No
SpO2 / pulse oximeter Yes Yes
Skin temperature No No
Accelerometer No No
Gyroscope No No
Compass No Yes
Barometric altimeter No Yes
Ambient thermometer No No
Microphone No No
Speaker No No
Connectivity
Bluetooth No No
Wi-Fi No Yes
NFC payments No No
Cellular / LTE No No
ANT+ No No
Music storage No No
Third-party apps No No
Satellite communication No Yes
Health & Fitness
Sleep tracking No Yes
Stress tracking No No
HRV tracking No No
Training load No Yes
Training readiness / recovery No Yes
VO2 max estimate No Yes
Running dynamics No No
Body battery / energy score No No
Menstrual cycle tracking No Yes
Fall / incident detection No No
Guided workouts No No
Multisport / triathlon mode No Yes
Software
Operating system — —
Companion app — —
Voice assistant — —
Contactless payments No No