I like notes and npubs - easy to enter in a command line app or generate a QR code for capture.

I find adding the protocol clunky and add modify for internal app use. I hate dealing with percent encoding. Ok, for deep link handling by apps/platforms but that’s not my context.

This is what I do:

npub -> hex string, bytes, or object
note -> hex string
relay url -> add wss:// or ws:// add - if already specified leave alone
mint url -> add https:// or http:// - if already specified, leave alone