I switched from Fitbit to Apple Watch last year. I was a bit confused at first as the logic is different but in the end I got used to it. Everything is displayed nicely and I do a little walk of 13 km each day, I find it more usable than my Fitbit. I feel more committed to closing my rings now than previously with my Fitbit, weirdly and the Watch helped me lose some weight. I deleted all my data by contacting them when I heard Google bought them.
Only problem you should be aware: you need to charge it every day. I adopted the following routine: charging from 8pm to 10:30pm, sleep with AutoSleep from 10:30pm to 7am, use it all day until 8pm with a 2h30min workout in the afternoon. At 8pm I have depending of the day between 20 to 33% of battery left.