Heck, lemmy is barely supported. The dev just bootstrapped the lemmy API into the reddit app and published it as a beta. We were all happy for that, but it will be a while before it's a polished lemmy app.
If you aren't the kind of person that says things along the lines of Sync is bad because it has an ad supported version which is optional but it shouldn't be optional for some reason, then we aren't talking about you.
to answer your question, sync has a nice and modern user interface that is enjoyable to spend your time with.
Jerboa is... functional, Sync has design and thought behind its interactions and user experience. If that's okay with you, then that's fine. But I wasn't happy there.