I’ve mentioned a couple of times that, at least in my opinion, KDE is losing out to GNOME because there simply aren’t as many Qt applications as GTK ones. Competition breeds quality, and as a result, I find Qt applications in general to be inferior.
Of course, I can’t just say that and not back it up. In fact, I’m not even sure if I’m right! Because I’m using KDE 4.2 at the moment, I thought this would be an ideal time to really test some Qt and GTK applications extensively. In all cases, I tried to use Qt applications first, and only installed the GTK alternative if it either showed bugs, crashed, or simply irritated me to the point of madness after several days.