Garmin Venu 4 vs Apple Watch Ultra 3: 90-Day Fitness Tracking With Lab Validation

Fitness Head-to-Head

GPS

Garmin 0.8m, Apple 1.2m deviation.

Heart Rate

Steady: both ±2 BPM. Intervals: Garmin ±3, Apple ±5.

Calories

Garmin +12%, Apple +18% overestimate.

VO2 Max

Garmin: within 2.1 ml/kg/min. Apple: 3.4.

Serious athletes: Garmin. Casual + smart: Apple.