If you’re signing up for ATproto, I’d avoid Bsky and go for Blacksky instead. Although on Blacksky, the two public PDSes you can pick are cryptoanarchy.network and myatproto.social.

Also, Bsky has been trying to push ID lately while Blacksky isn’t yet, but there’s the chance that Bsky corporate could start to get hostile against Blacksky and other third parties and start to block them at some point.