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?
Mastodon right now is essentially macroblog and/or microblog. Entirely designer for different purpose than Lemmy.
Any group-based social media will have higher possibility of interaction due to easier way to find similar interest, whether Lemmy, Reddit, Facebook Group, Misskey Group, even traditional self-host forum.