I call it X1 because it's simple and makes sense to me. XB1 sounds okay too but makes me think of the original XB. Same story with XBO, okay but reminds me of the original.
Xbone I see have the most votes and I can't understand it. The word is so long that you can just write the full name, no need for abbreviation and especially not to misspell One with a lower case O. Makes no sense to me. And X-bone is what it sounds like. Kind of nasty word and sounds more like a mock word to me.
But each to their own and what not. :)








