On the other other (third?) hand, sometimes you want GPGPU which even in laptops can give some speedup, not to mention not having to debug it on large computer. With intel, you're out of luck there.
Read the ati support list before buying an still closed source driver board.
Nvidia may seem better because they only have close source drivers. Compare it with catalyst, and they are pretty much the same (except you will not get dual monitor easily with Nividia)
But I think they promised OpenCL for Ivy Bridge.