Fitbit Ace LTE v2
Garmin Fenix 8 v2

Device Details

Activity Features

Activity Tracking: Monitors steps, active minutes, sleep and distance. Tracks activities like running, biking, and sports. Has goal setting where kids can set daily step and activity goals. Movement reminder to encourage kids to stay active.
Family account: Parents can manage and view their child's activity.
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

7+ years

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

Battery

Up to 16+ hours

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

Ace LTE

Fenix 8

Phone

Yes

Yes

Price (USD)

$229.95

From $1,000.00