Jerboa's improved a lot lately, but I've also been using Connect when it has problems. When the Lemmy versions of popular Reddit apps come out, I might switch to one of them since I expect them to be more refined out of the gate.
The thing I think I want the most is a clone of RIF's comment navigation. Being able to easily skip through long threads is a feature I didn't realize I'd miss, but I used it all the time on there. Jerboa kind of has it now, but it doesn't let you move up through child comments and the "active" comment is always at the top of the screen.
I hope Google dusts off Project Ara one day. That looked like a cool concept that's only now being made into a reality to some extent.