Ok, first I just have to say, that I think the whole reference to Windows machines as "PC"s and machines running OS X as "Mac"s is just stupid. It doesn't matter what operating system its equipped with, if it sits on your desk, or on your lap, and is used for personal computing, then it is a Personal Computer. Its a pet peeve of mine, whenever this comes up in conversation. Sorry, the tech nerd inside me is impossible to contain most of the time.
That being said, I'm not a big fan of OS X, because, as a programmer, I find it easier to run programs used for development in a Windows environment. I used to hate on OS X users because I thought it was an OS for dumb people who didn't understand how to work a computer. But after maturing a bit and studying Computer Science for a couple years, I quickly learned the error of my ways and ditched that point of view. There are some redeeming features of OS X. For one, it carries on the legacy of Unix which is kinda cool. I also like GNU/Linux for some applications, such as its price point (free ninety-nine is my favorite price). I wanna build my own desktop soon, and I have to decide if I want to shell out money for Windows, or just go with a GNU/Linux distro before I start the planning process.