Oblivion runs a lot smoother on the PS3,
I own both consoles, as a matter of fact i owned already 4 x360 my last one is again gone for a fix.
The problem is not the hardware, it is the way programmers program,
the more they use directx elements, what they do a lot, you see problems
other programmers that build from scratch have less problemms and better results.
I am not saying one is better than the other, i like them both and in my opinion it is all about the games, and yes at the moment ps3 is lacking the amazing games.
But it looks like it will be the same as with PS2 in the beginning there were loads of moaning from programmers, later on that changed and some really beautifull games arrived on that platform.
Teams like EA, are not the best example they just wanna make money fast
and deliver lazy ports (konami as well at the moment)
I think it will be interesting to look at assasins creed, the problems everybody was talking about were occuring to X360 and PS3, they have stated are all resolved, i hope it is not PR talk.
Lets just enjoy our consoles, PS3 or X360 (and some both)
and our games FIFA or PES enjoy the good things they can live together you
know.
Peace