I tested the Apple Watch Ultra 3 and Garmin Venu 4 on a 7km run, vs a chest-worn heart rate monitor

I tested the Apple Watch Ultra 3 and Garmin Venu 4 on a 7km run, vs a chest-worn heart rate monitor
I'm testing the Garmin Venu 4 and the Apple Watch Ultra 3 against the most accurate heart rate monitor on my lunchtime run.