Reddit doesn’t have the post scheduler that PieFed has, which integrates with Lemmy. As a community-runner that one’s super-useful to me. Also on the PieFed side, we can add both hashtags and flair to posts, whereas on Reddit there’s only post flair.

IIRC both Lemmy and PieFed have the ability to sort posts in more useful ways, for example there’s 8 different ways to sort “top” posts, as well as sorting by “scaled” and other criteria. TBF, Reddit’s 3rd-party “RES” extension is just plain awesome, and adds lots of things basic Reddit doesn’t have.

Anyway, each app and/or software means of looking at the Fediverse will offer a slightly different mix of features and characteristics. I’m not really the most knowledgeable on that stuff, so again, I urge you to take these questions to an AskLemmy thread, or similar. Could just search on them too, or ask an LLM.