I made a folder with my fav lemmy apps that I tried so far, and they are sorted by favorite to less favorite. By far, wefwef is my most used and I do switch to lifoff sometimes. Also, the official lemmy app is really not bad compared to reddit's official app. I would say try all of them and see which one works the best for you. waiting for sync and boost to launch. let me know if you have any other suggestions I haven't tried yet.
I'm trying out Summit now and it's quite good. But I don't think it has a list of communities that I'm subscribed to and I can only choose to either see all posts from my "subreddits" or all from my instance/federation. Apart from that it's good.
I experience the same trying to submit a comment. Get a server timeout error, so try again and again. Some times comment get posted multiple times other times I hit back thinking I've posted and it's not there.