according to my notedeck nodes, nos.lol has the largest variety of notes

monad> ndb -d ~/.local/share/notedeck/db print-relay-kind-index-keys | cut -d$'\t' -f1 | sortur | cat -n | head

1 85648 wss://nos.lol/

2 80846 wss://relay.damus.io/

3 70324 wss://relay.primal.net/

4 42720 wss://nostr.wine/

5 28341 wss://relay.mostr.pub/

6 7599 ws://relay.jb55.com/

7 2406 wss://relay.fountain.fm/

8 772 wss://nostr.land/

9 327 wss://relay.nos.social/

10 166 multicast