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Sincere answer: NONE. It's all garbage.
If you want to do your own homework: there's a link to each nostr user where it says "relays".
How dumb you are to not click that link and see what relays are others using?
Seriously now, are you so dumb?
Can you share some of your favourite relays?
I've always found this to be true, but it is hard to figure out which relays are worthwhile.