Gnome but thats because im a big time laptop user. The way i use my laptops works really well on gnome. I hide the top bar, and have whatever im doing taking up the entire screen, and then just use gestures to navigate it. Side to side 3 finger swipe switches desktops, 3 finger swipe up takes you to task view, and with the small screen id hate to have some sort of taskbar.
If i was using a mouse i would probably want something more windows-esque in its design which i think KDE does better. So for a desktop id probably go with that.
i have no idea not even sure what a netbook is