Gigabyte Brix: Iris Pro v.s. APU

Hey guys I was looking to build an ITX build but found out about the Gigabyte Brix. I recently saw a video showing the different models of Brix(s) and saw that they have one with Iris Pro Graphics and another with the new AMD A-8 APU. Although the APU version of the Brix didn't get a lot of spot light I would like to know, how would it compare to the Iris Pro Version graphically?  

The apu version also had dedicated R9 275 graphics so it wins.

Graphically the apu will beat out the iris pro but for CPU performance the iris pro will destroy