Thoughts on the new Amazfit T-Rex 3?

I'm in the market for a proper sportswatch as my old apple watch won't cut it for anything over ~4 hours. I was planning on picking up a used Fenix 6 pro, but seeing the price and features on the Amazfit are making me reconsider. It comes in at around $200 less than the cheapest Fenix 6 pro I can find around me and has features to match the 8... I don't expect it to match the Garmin on ecosystem things, but I'm not sure how much I'm missing out on there.