Ok, I don't want to start a war, but here goes:
I downloaded the Demo on my PS3 and 360 and have been playing them both, and I noticed some differences.
Graphics: Graphics were the biggest noticeably difference. On the PS3, the colors were more vibrant, had more depth, and seemed much brighter, almost giving it a wet look. The Xbox color palette seemed dulled and faded, almost Xbox 1 color scheme, which is weird because I have seen the same kind of wet looking color in Gears 2. So to mine, and my wife's naked eye, the PS3 won.
Frame-rate: I couldn't tell any difference between PS3 and 360
Controls: The controls seemed tighter and more responsive on the Xbox 360 vs the PS3. I can't give a scientific reason, but the controls seemed better on the 360, so if I had to choose just on controls, I would pick the 360
Ok the above is just my opinion. The only real thing my wife could tell was the graphics between the 2, and said the PS3 version looked much better.
Ok, I am a Graphics whore, So I really want the best looking version, so you would think I would want the PS3 version. The problem is, I prefer a Gamer Score and Achievements over PS3 Trophies and Ranking. On top of that I have many more friends in my friends list on the 360 than PS3.....So I will buy it on the Xbox 360, and then when it goes cheap I will also buy the PS3 version, and enjoy it again.
Ok I can hear your fingers cracking wanting to type and give me your opinion, and I welcome them. Just Remember this is just my opinion, not a scientific research firms years of studies...LOL. I want to read what others think because I may be missing things, and will gladly go back and look. One thing, I am going to be playing this demo over and over again.
So what do the rest of you think???? (Please No Trolls and No Flaming..Thanks)