this Youtube channel does great in depth reviews
Apple
A place for Apple news, rumors, and discussions.
yep this is the answer. The guy tested everything. Long story short, apple is better in terms of accuracy (HR and sleep). If you want even better HR you can do it via a chest strap but that's about it. I also have a polar OH1 (or the newer variety sense) which they say is golden standard for optical HR tracking.
AWU GPS is terrible during open water swimming. I switched to an Epix Pro and couldn’t be happier as a swimmer.
I use an Apple Watch and a Garmin device for tracking all my workouts. Generally I get the same data from both devices.
Can you tell me which models do you use?
No way. Garmin uses all three satellite constellations and has a host of features for athletes Apple Watch can’t remotely touch.
Years ago Apple had a better optical hr sensor but at this point everyone is using a good one.