I have a Fitbit Sense and a Watch-7. That's $299 vs. $851. So I'd say the price alone is something to consider.
As for fitness... I jog and track my weight daily (on a Fitbit auto recording scale). I feel the Fitbit Sense & health app (along with the scale) is a much simpler and more effective fitness system than the Apple Watch.
The Fitbit application works well on PC, iOS, and Android devices.
The Fitbit Sense has an app store and can do most of what a Watch-7 can do including run customized watch faces, etc...
The Fitbit Sense battery will last for days, not hours.
The thing you need to be aware of is that the Apple Watch works 98% of the time but the Fitbit Sense only works properly about 75% of the time. The main reason I upgraded from the Fitbit Sense to Watch-7 was because on occasion the Fitbit Sense will "hang" and it can be frustrating.🤬
I once let the battery die in my Fitbit Sense and after I charged it, it took me hours of constant fussing with it to get it to turn back on, and it's not just me, there are plenty of Youtube videos of other people with the same problem.
Closeting thoughts on this. . .
I prefer the Fitbit Sense for health & workout tracking (including the cool auto tracking Fitbit scale).
However, the Apple Watch-7 just works!🥰
No hang-ups, no missed taps, no mysteriously going to sleep, etc...
Perhaps my particular Fitbit Sense is defective and I should have returned it, but from looking on-line it would seem there are others with similar Fitbit issues. I guess it's just part of learning to live with a cheap $299 watch.😐
It's a shame because considering the price, software, and accessories, the Fitbit Sense is great little watch.
keep us posted on what you buy!