It very much depends on what your use case is for a wrist device. For me I am more interested in the fitness and sleep tracking. Asteroid OS does not provide that as of writing. I also like that I only charge my device ~1/week even with exercise tracking. In particular, my Bip would last for almost a month. I only switched to the Band 5 for something smaller and more comforable when sleeping.
I find AsteroidOs cool and ambitious, but that also makes it harder to incrementally adopt. It’s essentially a new OS layer on top of the WearOS kernel. That means they have to reimplement all of the features that people would want from the original device like handling calls, health tracking, and other device native features. Not to mention that the devices are bigger and have shorter batter life than the Amazfit devices @aarckstone asked about.
Whereas Gadgetbridge is just an API interposer to make a non-private wearable private by only storing data locally.