Lemmy naturally concentrates unconnected users with similar interests thanks to reddit-style communities. Mastodon follows the Twitter style where you have to find and follow individual users to get their microblog content, and its harder to isolate certain topics or interests except across the entire service via hashtags. Individual users on their own are very uninteresting and bland.
Lemmy has fewer users but they as a whole generate more active content than Mastodon does thanks to community specialization, since the Twitter style posts require some critical mass of users following to generate interesting discussion (something that basically never happens unless you’re already a celebrity)

So many posts perfectly summarising why I’ve always preferred the reddit format over twitter. On one you follow topics, on the other you follow people. I prefer to hear a wide range of views on one topic rather than one persons views on different topics.

Mastodon feels like a fucking funeral.

You’re clearly nowhere near the good parts, then.

In my experience, once when you find your way into the correct circles the microblog-verse makes the “shitposting” of Lemmy look like r/memes. I do agree that discoverability could be better though, it took me 4-5 months before I got the hang of it. And now I barely check Lemmy despite my Lemmy account being older than my earliest microblog account (under this name, anyway).

One important thing is that your instance matters quite a bit more than here. Starting on a large general purpose instance (especially if it’s mastodon.social) and just following Large Accounts and Nobody Else like most people recommend for some reason is just setting yourself up for disappointment. Instead, get on a smaller interest-specific instance (rule of thumb: the weirder the domain the better your experience will be!) and follow the local timeline (and on good software, the bubble/recommended timelines). And post stuff/interact with people. Don’t be that one person that does nothing but boost news bots and occasionally butt into replies of people asking rhetorical questions they already know the answer for.

(Perhaps Lemmy is better at news or whatever, I wouldn’t know as I block all news communities I can find – I just don’t see the point as all the discussion around most news ends up predictable, unproductive (not that internet communities necessarily need to be “productive”), and unnecessarily angry)

Also in a world with usable™ Misskey forks and Akkoma I think the limitations of Mastodon the software are really starting to show, and I urge anyone who’s been disappointed in Mastodon to try other microblog software. (Quotes are already a thing if you know where to look! So are emoji reactions, because people have more emotions than :star:)

They don’t have beans on Mastodon.

I find the microblog model to be fairly limiting. It’s good for posting quips, memes, and news, but it’s terrible for having any sort of a meaningful interactions. A forum like Lemmy facilitates much more interesting discussions.