the main difference between the 2 units is, the Windows version is optimised for close work (think monitor to desktop) and is not subsidised in cost. (yup thats right, the Xbox version should cost the same as the Windows one... Games sales and MS subsidise that sucker...)

the Xbox one works at 2-6ft ranges.

for MoCap only I'd lean towards the Xbox one, but for more general use, I'd look at the windows one.. but someone mentioned it's possible to hack a Xbox unit to work as the Windows Unit. but they did'nt give any details...