I like Mac -- it's simple, easy-to-use, and it has everything already integrated.
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My all time favorite OS is NeXT. For Desktop computing and development I like OS X, but its a close call between OS X and Gentoo Linux.
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ITS, the Incompatible Timesharing System, written at MIT by the AI lab around 1969 completely in assembly and usable for PDP-6 through PDP-10 systems. It was likely the first operating system to offer transparent inter-machine file-access through the ARPANet. It was also was the OS that birthed EMACS and nurtured the early development of MacLISP, the primary parent-language to Common Lisp. Many of its interesting real-time and time-sharing features have been incorporated into operating systems of today.
Source(s):
http://www.gnu.org/gnu/rms-lisp.html RMS mentions EMACS initially running on ITS

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I'll use Windows 3.1 until the day I die.
http://www.kernelthread.com/mac/vpc/images/win311.gif
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Please don't take away my geek card for this, but Windows XP is my favorite operating system.

I don't fiddle around too much with computers, and Windows, though clearly buggy in places, allows me to do a little bit of fiddling with menus that I've become familiar with since first using Windows 3.1.

It works correctly, most of the time, and I don't really have to think about it.

Furthermore, although I like the concept of running a Mac, and I wouldn't be against an OS with more direct user involvement, I like being able to use off-the-shelf software and know it will work most of the time. Also, I don't have the time right now to try to set up and maintain a new machine or have a friend or family member do it.

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Windows XP SP2 is probably the best OS.

Windows as a whole has more software developed for it than any other OS.

Linux, is probably the most secure and Mac, is probably the most fun!
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