The hardware is going to make a much bigger difference than the OS. Maya should run with few problems on Windows, Mac, or Linux, assuming you've got a legit copy and the hardware is compatible with the OS.

All that being said, it probably comes down to your personal preference. Whatever you're most familiar with will give you least headaches, and if you want the performance, see what hardware you can get for your buck (like an SSD and lotsa RAM).