I've pretty much only been using Kbin instead of Lemmy and I really haven't run into any problems. The dev just fixed the weird thing where upvotes here did nothing on Lemmy, you had to favorite it instead. But that's gone after users requested it.
There isn't a native app yet but one is in development (near the bottom). It is a newer platform compared to Lemmy (same as Calckey compared to mastodon) but personally I like the UI better. Plus the native integration to mastodon is nice. I've been using it as a PWA for the time being and haven't had any real issues, but I'm waiting for an app as well 😅
Being new, I'm on the main instance kbin.social. It's still small and there aren't many instances yet. Hopefully that will change. But nice thing about the fediverse is you can try it out and see what fits for you. Hell, you could join Friendica (FB equivalent) and access this content there if that floats your boat. So give it a try and see what you like!