The A8-7600 will have the edge with gaming, thanks to the better iGPU. The edge won't be huge, though. However, if you have a Motherboard that supports iGPU overclocking, like the the ASUS A88X-Plus (or Pro), you can still overclock the iGPU for further gains.
The biggest advantage of the A8-7600, though, is the lower power consumption, and better Dual Graphics options for future additions - not that many people consider that a bonus.