everything looks better on linux
I have no idea what it is, but everything on my computer screen just looks BETTER under KDE. Now, that's not to say that KDE is pretty (it's not), or that OS X is ugly (it isn't), but for some reason, my eyes LOVE the fonts and spacing and, well, niceness of the full KDE 3.4 experience.
Oh, and KFM kicks the shit out of the Finder. Really.