Ask HN: What's different from paying with bitcoin?

HN,

I've been wondering why it is that the idea of building UI's on top of bitcoin seem all the sudden such a good idea, but what it all comes down to for the greater public, is that they can transfer money to oneanother, when this can for instance also be done with the Paypal api or such services.

So please, tell me what makes it better for people to transfer money to a wallet id then to a bank account.

Thanks for your comments in advance!