Well, I dumped Linux on the computer I'm typing on, and am just running Win 7 here. BUT... there is sort of a moral dimension to running operating systems that aren't proprietary. Proprietary software makes the world a big mystery; you can't change it and its object is to hide from you how it works.

So, if you like a world that is alienating and mostly owned by someone else, support proprietary operating systems. If you want something that you can tinker with and understand, support non-proprietary.

It's a religious imperative.