I have been an Amazfit user for several years and I finally decided to switch to Apple Watch after watching many reviews and videos, maybe a week of use is not enough but I can now make a verdict:
My negative thoughts: I miss the autonomy of Amazfit watches, the Apple Watch 9 barely lasts two days with regular use, my old GTS 4 lasted the entire week. Using the Apple Watch for the first time I found the worst surprise that I had not seen in the reviews, the auto-brightness cannot be turned off and in a dark room you can barely read the screen, I will have to deal with that. My positive thoughts: Everything else, I loved the app on the iPhone, I loved the watch faces, I loved the integration with the Nike Run App and Strava, I loved how all the sensors work on this watch, better than on Amazfit, I loved the brightness peak of the screen in daylight, and I loved the number of apps compatible with Apple Watch, many more apps than Amazfit. If it weren't for the battery and the auto brightness I would give it 5 stars
Many people say that if you are a series 6,7,8 user, the jump to series 9 is worthless, not a big difference. But I can say that if is your first time with apple watch, you must try series 9, ultra if you want to spend a pair of extra hundreds.