A lot of people talk up PieFed, and I think I found a community I like (RetroFed, they’re based around retro gaming, but they’re also new, so I’m not really trying to push them per se) so I signed up with them… so, aside from looking a little different, what’s really different here?
Not really looking for a “PieFed vs Lemmy” debate kind of thing, more of a “hey check this out” vibe.

Mlem is the app I use on iPhone (and I’m in the beta); I use Voyager on Android, though I’m on my Android phone less.
Duplicate as in cross-post, like say someone posts the same thing to a community of the same name (or even not) on, say, .world, .ml, and a couple others? I’ve heard about that and that’s one reason I joined PieFed.
Yes, it’s one of Piefed’s best features
Mlem dev here. Mlem currently supports two PieFed-exclusive features:
PieFed has many more features that we don’t support yet (see Rimu’s message). We do not yet support crosspost merging.
The most feature-complete experience on mobile would be to use the PieFed website directly. There’s a detailed comparison of different apps’ support for PieFed features here: https://piefed.social/community/fediverse/wiki/piefed-app
Yes
Yeah, so like I’m on Interstellar right now and if the same post is in multiple communities and I open it up each of their different comment sections will be there.