I’m betting the ultra will be exactly the same as your 8.

Something worth considering if you’re REALLY happy with the Apple ecosystem: buy a used Apple Watch of like series 5-7 for cheap off marketplace (or an SE2) and use it for work, when you get home, swap it for a nicer, non-shitkicked Apple Watch of whatever model. One will always be on your wrist and the other on the charger, and this way you will actually conveniently get sleep metrics as well.

Until I switched to garmin my goal was 2100 per day, male, 170. Usually.