I do triathlons, a watch for swimming and running, a dedicated bike computer.
Apple watch is fine for running, and I love the single device for running while listening to podcasts etc.
But, I wear my Garmin (and use the ultra as an iPod during exercise)
the ultra is a pain to use when swimming needing combinations of button presses for control, and I get tired of it starting random stuff when I get in the shower. It just needs better button configuration. The action button is more like an actionless button. Let me start and stop a run or swim via the action button, let me lock the screen with a long press…there’s a lack of config allowed. Even the devs get frustrated because Apple just lock stuff down.
the other problem for me is the reliance on apps that we trust but are likely written by someone who is not medically or fitness trained. HRV is not the only metric for recovery.
so I’ll stay with my Garmin until I get some better usability from my Ultra, and I cannot see this in IOS 10.