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've never heard of Nostr but Mastodon is a twitter clone and I don't find that style of website suits discussion well since you subscribe to accounts rather than communities.
I find myself talking more on lemmy as others say because it's easier/made for talking about topics. Mastodon and other fedi services center around following the account that made a thing rather than the thing(s) themselves. And that's fine, both have their place.
I've never understood what twitter style websites are actually for. They seem to have a tiny niche of celebrities and known personalities making a statement with no reasonable conversation stemming from it.
I don't understand how that structure was once one of the largest social media platforms in the first place.
The content already exists. And are interacting around that content. Rather than generating more and more content forever in a loop leading to nothing but more noise.
And you have direct access to these people! If a reasonable conversation is lacking it's cuz you are not bringing the party to the bar.
You are the star that makes the conversation happen.
So dial up a person 100x smarter than you. And find something to ask them.
Like a ChatGPT but will actual intelligence and passion at the other end.