As far as I can tell from my venture into Mastodon’s feeds, the demographics of that part of Fediverse isn’t that different from what Lemmy has: the same political takes, FOSS stuff, “big corpos bad”, etc.
I wonder, is there anything that Mastodon excels at that Lemmy just doesn’t provide? For example, I noticed that there are game developers and artists posting their stuff on Mastodon. Not many game developers (or any creatives, really) on Lemmy though.


You are comparing apples with oranges. The two apps serve two different purposes. Mastodon is mostly for individual one on one interactions, lemmy is for building communities.
In my defense the question was about comparing apples with oranges, so I did.