Fitbit Charge 6 v2
Garmin Fenix 8 v2

Device Details

Activity Features

Activity Tracking: Monitors steps, calories, distance, heart rate, sleep tracking, blood oxygen, stress tracking, GPS, energy levels, hydration and women’s health, body battery, readiness for workouts Tracks running, cycling, swimming, yoga, and other multi-sport tracking. Also has sports apps for workouts modes and guided exercises. Allows creating and customizing workouts.
Performance metrics: Provides VO2 max, training effect, and recovery time.
Maps: Includes preloaded topographic maps.
Notifications Displays notifications from your phone.
Water resistant: Yes

Activity Tracking: Monitors steps, calories, distance, heart rate, sleep tracking, blood oxygen, stress tracking, GPS, energy levels, hydration and women’s health. Tracks running, cycling, swimming, yoga, and more. Also has sports apps for workouts modes and guided exercises.
Performance metrics: Provides VO2 max, training effect, and recovery time.
Maps: Preloaded topographical maps for navigation.
Water resistant: Yes

Age

13+ years

13+ years or 22+ years for ECG app (only available in some regions)

Battery

Up to 7 days

Up to 10 days

Brand

Fitbit

Garmin

Continuous Glucose Monitoring (CGM) Compatible

No

Dexcom (G6 or G7)
Freestyle Libre 

FSA/HSA Eligible

Possibly with Letter of Medical Necessity (LMN) or a health reimbursement arrangement (HRA)

Possibly with Letter of Medical Necessity (LMN)

Model

Charge 6

Fenix 8

Phone

Yes

Yes

Price (USD)

$159.95

From $1,000.00