I was given an Apple Watch but it seemed overkill and needed daily charging. I’m currently using a Garmin Vivoactive 3. The interface works seamlessly with Strava for biking and running. Weakness: Drinks battery with GPS, about 8-9 hrs of ride data. On the plus side, it fully recharges in an hour and I typically get 3-4 days of weekday running & cycling. Garmin’s Connect interface works well with iOS. Around $120 right now if you shop around - Garmin is pushing newer models like the Vivoactive 4 ($300). Of course you can buy a Fenix or Enduro model if you want to spend more. For cycling, I like the touch screen of the Vivoactive series.