My experience with Kbin is that it seems more limited on Federated posts and that the smaller Kbin instance (I use Readit.buzz) seems to be lacking some of the posts and thumbnails that I see on Kbin.social. It seems like Lemmy works better on the smaller instances (not Lemmy.world) than Kbin does (not kbin.social).

I have not really used the Kbin microblog—I am using Mastodon for that.