Macs do get viruses, just rarely, and because of the way security is built, the average virus can't really do much on a Mac. I like PC better for the simple fact you got access to more programs/games. The dock also bothers me on Mac. It looks pretty but gets in the way and takes up too much of the screen. Of course you can shrink it to a very small size, but then what's the point of it by then. From my experience, Windows OS locks up a lot, but on Mac, the OS is far more stable but applications lock up a lot. I installed Mac OS X on my Dell and it runs pretty well, but I only run Hero Poker on it basically, so I haven't tested it out much. Ignoring which OS has the most access to proprietary software, I choose Ubuntu (Linux). It's very stable and fast, but I haven't logged onto it in a while. I was using vmware to emulate windows on top of it for poker, but that was annoying. Might be okay once I get a second monitor.