Lemmy.world has open account creation, while Lemmy.ml requires an essay to create an account. For that reason, I believe .world has more users. But you can access content from either one no matter which you make an account on. Similarly, you could pick another instance or even host your own and still see and post content to other instances in the Fediverse.

I’ve tried out Mlem and Memmy, and so far I have preferred Memmy. The dev has been improving it at an insane rate too, so if you don’t love it yet, just wait a couple weeks and check again.

I think some instances have profile pics disabled? I’m not entirely sure though.

Fuck u/spez, indeed.