Galaxy Watch Ultra vs Huawei GT5 Pro

Guys I just ditched for Z Fold 5 for an Oppo Find N3 and I'd like to get a watch.

I dont really like circular watches and the only ones for android i see interesting right now is the Watch Ultra and Huawei's GT5 Pro. However I read somewhere that there are limitations to Samsung's watches and most functions wont work, whats true about that? I got global ROM phone with normal android.

I really like the design I used to have Apple Watch Ultra in the past, Samsung's watches look like upgraded version of that.