has less useful applications available for it.
someone has obviously never used amarok, kate, or konsole.
all the applications i've used on windows recently are worse than the applications i'd use to do the same things on *nix.
fortunately kde 4 will run on windows, so using windows won't be quite as bad once that happens.
i challenge you to name one app that i'd actually have any reason to use that runs on windows but not on *nix.
also, i used freebsd 6 and kde 3 on a machine with a 450MHz AMD K6-2 processor and only 56MB of RAM for a while and it was about the same speed as when i was using windows 2000.