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Is there really a difference between the different servers? I just browse all (It's lemm.ee btw)
Well if join a bigger one, the differences are minimal.
If you join a smaller server (10-100 people maybe), the All tab will have different communities as you can only see communities someone on the server has subscribed to. Smaller servers also have less potent federation bots which makes the content a bit more stale and less active. But that's small new servers mainly. As time goes on this becomes less of a problem.
On a bigger server (600 ppl for example), this is simply not too much of a concern. On a very big server (2-50k people), it can't even be a concern cuz they're connected to basically everything.
Well there are different rules on different servers, for a start. Which ones they're federated with can potentially make a big difference.
And then of course if you're just relying on All, you'll miss out on stuff that a bigger server might see because nobody from yours has subbed to it yet. But that's sorting itself out over time, and you can always speed up the process by making sure to regularly do a trawl for new interesting communities to pull in with a tool like lemmyverse.net/communities. Absolutely not a reason to sign up on a big server, just a reason to be more proactive if you're on a smaller one.
It's posts from all the communities lemmy.ml knows about, as opposed to all of the communities everywhere in existence. Given enough people and time the two lists end up being basically the same but obviously during a period of rapid growth like right now, new communities are popping up every second so it's gonna take a little while until all the major instances know about them.
Tools like lemmyverse.net let you keyword search communities based on your interests so you can find new things to sub to. If you're the first to do so from lemmy.ml, congrats, your server now knows about that community and everyone else on there will start seeing posts from it in All.