Factor 5 to go with PS3 over Xbox 360

In what kind of seems like a slap to the faceof Xbox 360, Factor 5 is bascially dumping any Xbox 360 work in Favor of PS3. Stating in an article on Cnet:

The choice boiled down to performance, Eggebrecht said at E3 in Los Angeles. His company has worked with Microsoft's Xbox 360, but found PlayStation 3's 3.2GHz Cell chip offered more processing power. The additional performance allows the gang at Factor 5 to more easily simulate the real world for a better game experience, he said.

We all know that more power doesn't necessarily lead to better games. Is there something else going on behind the scenes here? Maybe the next-gen Playstation is easier to program for or maybe Sony is going to be giving them some kind of deal. It'll be interesting to see if any other developers follow suit.