Here are a few links with more info for picking an instance:

Projects default picker: https://instances.mastodon.xyz/ (will release a new version tomorrow)

Biggest instances list: https://mnm.social/

Fediverse (GNU social + Mastodon) overview: https://radar.amberstone.digital/chart/fediverse

If you want more details from an instance: https://dashboards.mnm.social/dashboard/db/instance-detail?r...