Having tried all three, its a stark difference in how much more social Lemmy is comparatively. Its not even close. Almost all posts I’ve encountered on lemmy have interaction; whereas, more often than not, posts on the other two platforms have no interaction. Wonder what the driving factor is behind this difference?
I think the other aspect is the easy to follow discussion threads. IMO it’s the cleanest way to show and follow branching discussions.
I do like how it “looks” the most on topics. I wish mastodon had something similar revolving around their posts/hashtags.