@Ftumch My best recommendation would be to basically do what I did, get what you think you'd like, wear them on the same wrist for a few days while using the new app, keep the one that makes sense for your situation and if that's the new one, compare the crossover data so you can adjust expectations if needed... even within brands different devices have different hardware and software that'll make for their own idiosyncrasies, and I made a big shift going from an Inspire 2 (pretty basic tracker) to a Forerunner 255s (mid-tier running/activity watch w/performance tracking).
I'm really glad I compared this way though because one of my big takeaways was that my Fitbit gave me a lot more credit for a variety of things, which adds up to more caloric credit as well. I've been losing steadily on a 500 kcal deficit based on the Fitbit figures (basically RMR - 500 + step/activity calories) and if I had jumped straight to a similar adjusted deficit on the Garmin, it would be closer to a 1000 calorie deficit, relatively speaking. For these specific devices on me, Fitbit's 500 deficit figure was in +/- 100 cals range of what Garmin gave me as my total burned figure. A couple of days I did very handsy stuff like lots of kitchen chores and taking my kid school clothes shopping, and the fitbit racked up 1k-3k more steps than the Garmin (though they were close the one day that I mostly walked and took a short jog without doing anything weird, but then I still got about 15 more active minutes so the calorie burn stayed higher even when the steps were closer), and it also consistently gave me more active zone minutes every day than the Garmin even when I manually adjusted the Garmin's zone HR numbers to match the Fitbit's. Garmin doesn't do the adaptive calorie thing automatically, it just pulls your goals from myfitnesspal, so figuring out where to set that base intake goal was kind of important to me.
I think Fitbit does sleep tracking better overall, will add naps to the total and seems to be a little more accurate on start times, the Garmin would sometimes include time I know I was dozing off but still playing on my phone as sleep and only does one sleep window...any naps I took with my kid counted towards reducing the stress metric and increased the body battery score but didn't count towards my sleep score/hours. Not a deal breaker though, the data still overall made sense, the non-nap hours and sleep stage data were close enough, kind of a "similar but different" situation on a metric that really isn't actionable anyway (my sleep's going to be what it is, I can try and do better but nightly data isnt going to contain any one thing to make or break my sleep hygiene habits).
Other than those two things, no comparison and I love my new watch. There was some annoyance learning the Garmin app, especially when I tried to lean into the overlapping bits with expectations of how things had worked on the other platform (like the adaptive calories vs me having to do a little math to figure out how to make my goal work for me), but once I figured out how to navigate better and where to find my metrics/graphs, the difference in usability and how much data is available really surprised me in a good way!
The app didn't feel very intuitive at first, but there's no paywall for anything and once I set up the things I wanted on my dashboard in the right order, it's easy enough to use and has grown on me a lot. It's in dark mode, everything's set up to be easy to read and adjust, navigation took me a couple days to nail down but once it made sense, it made sense in a way that it's all easy now, I read you can also download your data through the web portal on PC to export to excel for your own analysis (though I haven't tried yet), no problem switching to landscape for deep data dives and can use two fingers to compare two different data points on the same graph.... I'm still getting used to it, and sometimes it's data overload, but overall, no regrets and I'm actually kinda glad Fitbit messed it up this bad with how much I'm liking the Garmin.
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