That hardly means anything though, code optimization is what counts, so a comparison would have to be on a game by game basis, and not system by system. It all depends on how much work the dev is going to put into each version, the toolset available, and understanding of the architecture. Which you would be hard-pressed to find a dev, that isn't first-party, who would tell you the PS3 is easier to program for. 8 total SPU's (6 available),GPU, and less memory bandwidth, compared to a 'PC similar', tri-core, GPU, and higher memory bandwidth. There are plenty of multiplatform games that look/run better on 360, soley because it is easier to optimize.
If it sounds like I'm down on Sony, that couldn't be further from the truth. I very much love my PS3, I just prefer games over system stats (that often-time mean very little). Though I didn't purchase a PS3 until some really good exclusives were available for it. Killzone 2, Uncharted 2, and inFAMOUS specifically.