I'm not sure if it is "more supported", but PC-BSD has been, historically, a KDE-centric project. I think most of the tools are written in Qt, which is the basis for KDE, so the developers are probably more familiar with KDE. I'd also like to point out that GNOME 2.32, the version in PC-BSD, is now considered at the end of its life by the GNOME project. Those developers are focused on GNOME 3 these days.
In short, if you like both, you'll probably find more support in this community using KDE.