Yup, this. But I'd give the option for email or username too, because some people like myself are oldskool and don't want discrete identities linked together.

Yup, this. But I'd give the option for email or username too, because some people like myself are oldskool and don't want discrete identities linked together. But for OP - prioritise it. You could design for a plethora of options. Choose the easiest use-case for you and your audience, and then do other higher priority stuff, and then come back to lower priority login method choices.