From what I understand I can subscribe and engage with just about any compatible fediverse website thing in a sort of generic reddit/Twitter environment, right? I don't think I really have to make this choice, just kind of poke around and curate my home page while the app developers work on ease of use and the fediverse itself works on communication and tutorials for people like me (people who fall up stairs)
Edit: I am transitioning away from reddit the vibe sucks and the ads are a joke
Yes in theory, but keep in mind whatever app you're using to interact with the fediverse may not necessarily support everything. For example, while mastodon supports displaying lemmy content, lemmy doesn't support display mastodon content. It's possible for it to, but it's just not a working feature at the moment.