What would it take?

Okay, so everyone here probably has their favorite operating system. I’d say that’s a given. Mine is Mac OS X. I know some of you love Linux, and most people here don’t like Windows too much. So my first question is Why do you love your choice so much? What makes it so much better than MY choice or someone else’s choice? Why won’t you use anything else? Is it cost, or support, or morals or more obviously form and functionality?

And my second question would be what would it take for you to drop your current choice for something else? What features in an operating system could possibly make you want it so bad that you’d switch and never come back?