my opinion
KDE rocks, Gnome sucks!

reason: KDE is more customizable (check out my screenshot right now: http://img156.echo.cx/img156/3406/snapshot12ko.png)
KDE looks better
KDE has more apps made (specifically with the letter K) than good old gnome


saying that, Gnome is good too and is far more advanced in usuability compared to Microsucks Windows but KDE overall just bags the prize.