I had started work on this at https://nostr.info/relays/ but nostr.watch is the best as far as I can see.

All fail to lead users to the right choice of relays which nobody knows how to determine so far. If the gossip model is to prevail, everybody should get on 3 or 4 relays with the client pulling from dozens if needed.

Paid or not paid is so far a very irrelevant criteria as no relay has a sustainable business model or anything suggesting they would be around in a year from now.

And also there is so far no client that checks for my events being stored on multiple relays. I want to know when my events are down to one or two relays to take action and mirror them to a new relay.