The solution to “what relay should I use” is the same solution to “which mastodon server should i use”.

Niche hobby/topic based servers don’t work. Location based servers do work.

Ideally, municipalities will run relays as public utilities. Choose the relays closest to your location. Simple. nostr:note15u2dnsxdll360a8lmzthfme5w5gujq7djhwm3pz7meazjf4llw5qaglfs9