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As expected, he said that Xbox 360 easier to develope for. PS3 has more potential but you must work much harder to get it out of it and much of the performance superiority of the PS3 is "in theory". Blu-ray means PS3 can have things like textures in uncompressed form, whereas compression on DVDs may make the quality poorer in new games like Rage.
I still maintain that Blu-ray is unnecessary for this generation of game consoles because memory bottlenecks won't allow games to take full advantage of 40GB worth of textures. The PS3/360 has even less memory than your average PC/GPU combination from 2 years ago, and so a lot of tricks are already necessary to just get things running smoothly with your typical 6 to 8 GB set of data without excessive loading. For A/V content though (even in-game ones), you can't beat Blu-ray's 50 GB of storage.
Sony put Blu-ray into the PS3 to help Blu-ray, not the PS3 (well not in the short term anyway).