i agree to that point that GNOME is stable than KDE try out switching the virtual consol while listing to XMMS the kde will not retrun to the X again. Buti also the KDE is the best interface for the migrating users from Bindows to *nx World
KDE is better in usability, accessibility and it follow standards for menus, shortcuts but GNOME is far stable than KDE. I used both for quiet long period, what I found is when you open a lot of KDE application it starts behaving like windows i.e. becomes very slow. And sometimes hangs.