Just gotta say this, Mac is the HARDWARE, which is equal to PC which is HARDWARE.. so comparing the two, with the hardware limiations of the OS taking into mind, Mac is 3000x better, first off, PC/IBM-Clone(windows) can handel up to 4GB of Ram, which is perthetic. Mac can handel way up of that, and you can currently get up to 16GB of Ram in a Mac Pro. much other things to take note as well, but that is one of the most important.
OS X is far better than Windows, often the case, Windows virus's are caused because microsoft has no envolvement with the hardware it's OS comes into contact with, and thus can't control certain things. Comparing that to OSX, apple has all authority over it's hardware, not only does it install it in it's own machines, but they build there OS around the hardware, which is often why the OS is much more stable, not only that it's easier on the eye, it's also alot easier to use.