OMG yes. We went with "choose the login option" and it sucked. Everyone created multiple accounts (we didn't support combined identity at the time) and it just..sucked.
Not that I disagree, but we have possibly the world's most boring login system with nothing but email/password and even then people manage to create multiple accounts. And then john.smith@example.com will email us, asking why the facilities they set up last month aren't working any more, completely failing to mention that they set them up using their john.smith.666@example.com account.
