Linux, *****.
But of the two, I choose Microsoft.
The Apple OS is the most expensive OS ever, considering the horrendously overpriced hardware required, if you are going to use it legally, i.e. not Hackingtosh.
A generic MP3 Player is as good, if not better, than an iPod.
Also, the iPhone and iPad are as anti-consumer as it gets.
I'm fairly interested in the Microsoft Surface. Seems good. And, for all the shit that Windows 8 gets, the tablet-style layout is great for touch-screens, and if you don't like it, you can always switch over to the classic desktop layout.