Until an Apple Watch is able to work with my ANT+ powermeter it's something I would avoid taking on a bike ride.
Garmin, Whahoo and other bike computers have had off crash alerts via a linked phone for, maybe, 10 years I think. Certainly since the Garmin Edge 1000 at least. That's a better fit for me as I'd never ride without my phone in a jersey pocket.
I'd always want a screen in front of me and not on my wrist.
Have you heard of that feature actually working? Fall detection is going to be _a lot_ less reliable from a phone than a wrist watch. In fact when I googled it one of the top three results is 'how do I turn off incident detection on my Garmin' due to false alerts.
Well I never actually used it myself as I haven't crashed for years but I know it's there. Equally though I've never heard of this working from an Apple Watch before so I don't think my anecdotal opinion on that is worth raising.
I do know I use stuff like VO2Max estimation, FTP estimation, recovery estimation, power zones analysis and hill descriptions for climbing while on the bike and those features are not available on an Apple Watch to my knowledge. I know for sure that Apple doesn't support ANT+ and that's important for me.
An Apple Watch might be a good companion if you're a runner or a cycle commuter but it appears to be pretty limited if you want to use it for cycle sport.
Garmin, Whahoo and other bike computers have had off crash alerts via a linked phone for, maybe, 10 years I think. Certainly since the Garmin Edge 1000 at least. That's a better fit for me as I'd never ride without my phone in a jersey pocket.
I'd always want a screen in front of me and not on my wrist.