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?
What really kills my engagement with Mastodon (aside for never being a regular Twitter user) is that posts in undesired languages still filter in my feed (I follow hashtags) even when I set up only two languages... Not everyone is filtering theirs I guess...