So you claim. I heard it was going to be the other way around, where the X360 would have its own exclusive content on XBL and the PS3 would miss out on that. Personally, I don't think it matters what console or PC you have it for, they're all going to have their own individual pros and cons. They can say all they want about the 360 having its own unique features, but I seriously doubt the PS3 isn't going to have something of its own.
Similarly, the PS3 is always assumed to be better in terms of aesthetic quality, but I can see it ending up the old PS2/XBOX/GC argument again where the PS2 always had more detailed textures, the XBOX had a further draw distance and the GC found a compromise for both and (most sensibly) just made sure the game actually had a decent framerate. There isn't going to be much between the PS3 and the 360, I would imagine, so I'd be very sceptic about these rumours if I were you.