You can use the PS360+ PCB, haven’t heard anything about having to use Crossbone with it as well. The PS360+ PCB will give you compatibility with PC, Xbox 360, Xbox One, PS3, and PS4. I’ve heard there are some slight issues with lag input but I’ve also heard that they are actively providing firmware updates and working on fixing this ASAP - there was beta firmware given out to EVO participants this year I believe.
But in short, the 360 version of the Atrox, unmodded, will not work on the Xbox One, or vice versa. However I believe both would work on PC, but I’ve only used the 360 on the PC myself, I haven’t had any experience with the Xbox One version