The best Windows version to program in CUDA C?

Hi guys, I’m Federico, I am approaching to study Cuda C and discover all its potentiality!
I am a Mac user, but I need to work with Visual studio, so I decided to install Windows on my MacbookPro using BootCamp.
For this reason, I’m asking you, from your own experience, which Windows version is the best to work with Cuda toolkit.
Thank you all for helping me.

I think there is a different between the XP and 7 drivers. Because of this I would suggest the XP.

Thanks Pasoleatis for your contribution!