Monero is a fork (copy with mods) of bitcoin. It is privacy focused so if that is your main and only goal, it may better for that use case. For everything else related to money, I would say bitcoin is your better choice.

Nostr is related to bitcoin in that most staunchly principled bitcoiners left traditional social media to come to nostr which is built permissionless, censorship resistant and decentralized which aligns with Bitcoin ethos. Finally, it has integrated bitcoin payments. People can zap my notes, comments, and profile. Aka they can instantly send me sats (small fractions of a bitcoin) to tip me for a good comments, funny meme, buying merch, or whatever else that might require a person to send another person money in a social setting over the internet.