There are 2 bunker formats and no way to even know which you’re supposed to use. It’s insanity.
Discussion
That seems weird. The format I'm familiar with and use is bunker://
Just checked the nips docs now and you are right. I would imagine the second format (nostrconnect://) is something the client needs to generate for users to copy and paste in their signer while the first format (bunker://) is purely generated by the signer and pasted on the client.
Ideally IMO, the nostrconnect format from a ux standpoint should be abstracted away into a button which signers can react to on mobile (deep-linking)