Unlocking The Chomper

[WinningPumpkin3]

I have GW1 on both my Xbox 360 and Xbox one... I am more likely to max rank on my  Xbox 360. The question is, will the GW2 read my Xbox one ranking or my Xbox 360 ranking or both? 

Would I have to move my Xbox one GW1 to a portable hard drive and disconnect it until I max out my Xbox 360 version?

Thanks for any help