I have different OSs on different computers
Desktop with Windows 7
Desktop with Windows XP and 98se
Desktop with Amiga 4.1
Laptop with OSX 10.6.1
Laptop with Windows XP

There is no one perfect OS, you can pretty much do what you want to someway on every OS, some OSs do things better than others, some make it easier than others, and some have more problems than others

That being said, I prefer to browse the net on OSX, torrent on Windows, usenet on both, video stuff on Windows, game on XP and 98se, and just have fun on Amiga

I have no interest in Linux and reading thru tons of forums to get my wireless to work, compiling kernals, talk about distos, take 6 months out to learn a distro just to move on to another distro, or here about how everyone on Linux is an uber leet nerd or whatever