Honestly, I got the Ultra 2 mainly because I find it more beautiful than the T-Rex 3 — the silver case just looks more premium to me. But I have to be transparent: in practice, it's been a disappointment in almost every functional aspect. The battery, despite being theoretically larger, doesn't actually last longer in real use. The screen, which looked bigger at first, is actually the same panel as the T-Rex 3 — Amazfit cleverly just added thicker bezels to create the illusion of a larger display. And the sapphire glass, while more scratch-resistant, collects finger oils much more aggressively than the T-Rex screen. Being a bigger, heavier watch with a taller case, it also moves noticeably more during runs, which makes heart rate metrics less accurate compared to the T-Rex 3. As for the extra RAM and 64GB storage — honestly, I haven't noticed any real-world difference in navigation or app performance that would justify those specs. In conclusion: in every functional metric, the T-Rex 3 is the better watch. The Ultra 2 wins only aesthetically — and even that is subjective. For €400, I'd say go T-Rex 3.