As a gamer, I'm pretty much forced to use Windows. I tried Ubuntu and love it, but until it can run any PC game I buy, right out of the box I'm going to stick with Windows. Linux drivers tend to always lag behind making it hard to play latest games on a Linux OS. If I weren't a gamer, I'd never use Windows and only use some flavour of Linux. Probably Ubuntu. Not just because it's free, though that's a powerful motivator, but because of the altruism behind open source. And the fact I really dislike Microsoft software.