Pros/cons of each:
Pleroma:
Pros; runs on shitbox and weird OSes, I like the UI, less jank than Mastodong still
Cons; development drama, the latest exploit and similar, DBs are assfucked with Pleroma.
Misskey:
Pros; anime
Cons; CPU hog, node.js, might remove reacts
Mastodon:
Pros; less likely to get blocked by schizoids at first
Cons; bloat, broken search, developed for mentally ill bubble wrapped schizos who will go back to Twitter to mope about not passing again.