Personally, I prefer Lemmy over Kbin because I hate karma and reputation points. I do not want to worry about downvotes, and Lemmy feels so fresh. I can post things that will receive lots of downvotes and not need to worry about losing karma.
I don’t really care about karma or reputation points. However, I really enjoy having a community where you can upvote and downvote.
Upvoting and downvoting is fine, because it’s different than having a profile-wide “score”, which provides an incentive that transcends making quality posts, and instead encourages shit like reposts in order to farm points. It also perpetuates a fear of making “hot takes” and other crap because you might lose your precious points. It leads to echo chambering.