I've ran Windows XP, Windows Vista, and Windows 7, all 64bit versions, ultra, etc. Anyways,
Across the board, W7 performs the best in every avenue. There was nothing that wasn't better about it. It takes a signficantly less amount of system resources than any other Microsoft OS. I'm running a pure gaming rig and w7 makes such a huge difference even if you have all the best hardware. Vista is soooooo clunky compared to w7. It's not even funny.
the bottom line is.
Windows 7 is the best OS ever.