I've only tried Jerboa, Liftoff, and Thunder so far but Thunder is my early favorite. I'll probably keep bouncing around until Sync is ready.

Las Vegas, taken with a Pixel 7A

Such a good app. I rotated through Boost, Infinity, and Joey over the years but I always ended up back on Sync. Oh well, I'm excited to see how Sync for Lemmy turns out.

Not as far as I know, I downloaded the APK from GitHub here: https://github.com/hjiangsu/thunder/releases And yes, it is very much an alpha release.