For Android there's Jerboa which seems to have the most features and Liftoff which is still getting there. Personally I like Thunder which supports iOS as well, I got it off GitHub
While Jerboa is an app created by the core developer of Lemmy, it's not as official app and the developer treat it as a personal project and freely blocks any instance he don't like there. I understand it's within his right to do so, but I still find it concerning due to his association with Lemmy and how many people think it's the official app.