Get the AMD Radeon 8730M.
Here is a comparison with the Nvidia chip.
Higher memory bandwidth
32 GB/s vs 12.8 GB/s
Better 3DMark vantage graphics score
5,869.5 vs 3,618
Better floating-point performance
499.2 GFLOPS vs 240 GFLOPS
Higher effective memory clock speed
2,000 MHz vs 1,600 MHz
Higher pixel rate
5.2 GPixel/s vs 2.5 GPixel/s
More shading units
384 vs 96
Significantly higher memory clock speed
1,000 MHz vs 800
Slightly higher texture rate
15.6 GTexel/s vs 10 GTexel/s
Wider memory bus
128 bit vs 64 bit
Slightly more texture mapping units
24 vs 16
Less memory 1,024 MB vs
2,048 MB