Which one is better?

[voodooj]

NVIDIA Quadro FX 880M Graphics with 1GB DDR3 memory vs ATI Mobility Radeon HD 5870 graphics
With 1GB GDDR5

 

[jyjjy]

The Quadros are intended for workstation/CAD use. For gaming the HD5870 will be several times faster.
To compare them to normal video cards the FX 880M uses the GT216 processor found in the GT 220 while the Mobility HD5870 uses the same core as the desktop HD5770.

 

[wa1]

^+1
Just like jyjjy said above...