Recently i followed some discussion by professional on GNOME vs KDE as desktop.
My conclusion is that currenly GNOME has edge over KDE. GNOME is
considered to be more stable, reliable and easier to handle than KDE.
Many people think that XFCE is faster than these two GNOME and KDE but
some feel that benmarking test unable to proof that XFCE is faster.
Some believe that KDE 3.5 was fine but KDE 4.x is not as good. Many of
professional prefer FlushBox.
But final answer is 'What you like and what you use i mean taste of user'
