I moved to KBin for a time when Lemmy had various issues such as auto-updating timelines that were hard to deal with and hugely broken algorithms for "Hot" posts, etc.
Somewhere around release 0.18.3 a lot of these issues were fixed and I ditched KBin. I figured in the long term, it was likely that Lemmy would have more development attention. It also used more straightforward terms like "communities" instead what KBin terms them ("magazines"), which just seemed to be unnecessary and confusing terminology for the sake of being different rather than because it made sense.
The KBin interface looks polished, but it hides a lot of fundamental issues with the software under the hood. I hope the project receives more dev attention and thrives in the long-term, however. It's good for the Fediverse that choices exist.