I agree with what's being said above, but I'm gonna give you my take as a pharmacist who takes a pretty serious look at health data. samsung watches are solid, but you gotta understand that by 2026 things have changed quite a bit. the chinese stuff on amazon really depends on what you wanna do with it. if it's just for checking your messages and counting your steps it's fine, but for heart rate tracking or blood oxygen, honestly I don't trust it as much with non-established brands. me I'm kinda paranoid about health data, it's literally my job to make sure that stuff works properly.
the real problem with chinese brands is long-term compatibility and updates. you're never sure if in 18 months the company shuts down their servers or changes the app. a samsung watch with your A54 you've got the guarantee it'll work for at least 3-4 years no problem. personally I've got both (a samsung on my wrist and another brand sitting in a drawer) and the results between the two aren't the same at all, especially for sleep and heart rate.
so my advice: if you really want it to be useful and reliable, go for samsung or maybe garmin/fitbit. yeah it costs more but you gain peace of mind and data that actually makes sense. but if you just wanna test it out for cheap, ok go ahead with some low-end chinese stuff, but expect dodgy results and servers that disappear.