Zkuq on 23 May 2013
XB1. It's simple and short with no danger of confusion. XBone would be my secondary choice just because I read it as X-bone and I think that's somewhat funny but it's really not a logical choice. XBOne and to a lesser extent Xbone are but XBone is not. Unfortunately I don't like those two; XBOne is kind of long and has too many capital letters, and Xbone looks somehow wrong. Xone isn't too bad either, it's short and simple. The others don't sound good to me.
To put it short:
1. XB1
2. XBone (for the humor value)
3. Xone
