;-D
Of course, I'm used to answering that question as I often have discussions with my neighbor who is a Linux-sysadmin.
For my actual computer, I had the choice between Linux and Mac because I need the underlying shells for work as I'm mostly writing R and Shellscripts. I used Linux for a long time and it was nice, but I spent too much time configuring, and too often software wasn't running that I would have liked to run. I had an old Windows PC for gaming that broke down several years ago and never repaired it because I just occasionally take the time for gaming now (< 2 evenings per week) and didn't want to invest much money into a thing that's just occasionally used. Also, I like the interface a lot more due to its hotkeys and other small but nice additions. When I'm sitting on a Windows machine, it always feels like a step back in time in terms of interaction with the machine.
The only big disappointment is the high price (which is higher in the EU than in the states), the graphics performance, and the inability of the OS to disable mouse acceleration...