Here's a performance benchmark on the ATI 5470 mobility card:http://www.notebookcheck.net/ATI-Mobility-Radeon-HD-5470.23698.0.html
Here's a performance benchmark on the nVidia G105M:http://www.notebookcheck.net/NVIDIA-GeForce-G-105M.13790.0.html
The ATI 5470 is definitely the better performer.
ATI 5470 Score with 3dMark05 = 6380
nVidia G105M Score with 3dMark05 = 4214
You can see more of their benchmarks and further details by following the links.