ATI's are a real pain in my azz to configure on laptops sometimes. Trying to get the HDMI's to play audio, getting them to clone\ show on a second display. Extending desktop. God i hate the Mobile ATI's. I won't buy a laptop with ATI graphics.
NVIDIA FTW Mobile wise...
As for Desktop Builds i'm on the fence. Being able to run 3d with one card is nice vs Nvidia thinking you need 2-3 Cards. Also you can run more than 2 Displays off a ATI card vs limitations to 2 monitors per card on the Nvidia's even though there are 3 outputs. More than likely since you went AMD your board is gonna support Crossfire so go ATI unless your board supports SLI and Crossfire then you can get either and be quite happy.
