What is the best video card driver for laptops?

Currently the best single cards available are the AMD 6990m and Nvidia GTX 580m.

These are available only from Clevo / Sager and other rebranded Clevo systems and Alienwares. However, high end business workstations have equivalent Firepro and Quadro cards which are just as powerful, this includes the HP 8760w, DELL Precision m6600, and Lenovo w720.

The gtx 570m, which is very similar to the 580m but with a 192 bit memory bus (3/4 bandwidth of the 580m) can be found on MSI barebone laptops.