SimplestBitcoinBook on Nostr: Nostr and/or BlueSky? Can anyone tell me the difference, pros/cons? I get that nostr ...

Nostr and/or BlueSky?
Can anyone tell me the difference, pros/cons?
I get that nostr is a protocol, but these clients and features already built on it are so good and improving daily, so just wondering ..
Can only handle one 'social media' account.. already 90% bailed on twitter, just using for spaces now mostly