Hmm here's one benefit #Kbin has over #Lemmy that I'm noticing: on the #Mastodon end of the #Fediverse, link posts from #Kbin include the article link, while #Lemmy posts include the link to the #Lemmy post, meaning that #Kbin article posts can contribute to #Mastodon trends, but #Lemmy posts effectively cannot.
However a big downside of both is that neither seem to federate with either #rebased or the #rebased instance I'm using properly (not sure which is the issue at hand here), which is disappointing.