Using lemmy directly will give you more control over the post and lemmy specific features...

Better marketing? Not sure...

And given #xmpp can do things like movim lemmy.ml, it's a shame it's not me widely used.

XMPP rooms a generally limited... but you can use the bridging function to access Matrix rooms, which there are more of ATM

https://github.com/matrix-org/matrix-bifrost/wiki/Address-syntax

Some information here from the #Pleroma documentation

https://docs-develop.pleroma.social/backend/administration/CLI_tasks/emoji/

Misskey, Calckey, Pleroma, Mastodon- All perform the same essential function. Microblogging (with minor differences e.g Pleroma has a 5000 word limit per post) Think Twitter.

Pixelfed is an image sharing platform - Think Instagram.

Friendica will give you a similar experience to Facebook (Macroblogging)

None of those platforms have real messaging (Direct messages, but not private or encrypted)

Almost all sites have an RSS feed...

https://rss.com/blog/as some advice on finding them...

Even a lot of fediverse platforms e.g Mastodon have RSS 👍

You can also try #Migu https://miguapp.pages.dev.A torrent streaming app 👍

Android - Linux etc

On the backend - Lower resource requirements on a server...

On the frontend - Post reactions (instead of just liking a post), Increased character limits on posts (default is around 5000 characters), can use markdown, BB Code etc formatting