Let me re-reply with actual info you can use.
I have been a Playstation fan since PS1. I loved it and hated the xbox and always thought halo was dumb compared to say Rainbow Six, Call of Duty ect. So, when I bought my PS3, I actually bought it when the rumor was that the Blu Ray movie of Resident Evil Apocalypse was going to have a playable demo of RE5. Of coarse it didnt and it was just a rumor and I was pissed. I was holding out till I had a good idea which system had better stability and games I like.
But I had my PS3, here are the definate pros.
BluRay
WiFi
Free Online
Those are the obvious, here is the not so obvious...
The hard drive IS upgradeable with a normal hard drive. The 360 is not, no matter what size hard drive you manage to put in the shell, it will revert to 120gb max, even if its got 500gb. And they charge an arm and a leg for such upgrades (360). This is where sony did the job right, they knew we would have already spent a minimum of $500 and let us decide on our own where we want to get our upgrades from.
The PS3 can play movies over a network with little to no setup, you dont even need to set up your PC as long as you have media sharing enabled. The 360, you need to input a code the 360 gives you into your PC. I didnt even bother setting it up on my 360.
Most games, barring the console specific like halo for 360, uncharted for ps3, are on both systems. Keep this in mind though. Blu Ray discs can hold like 30gb of info compared to dvd's which is 9gb roughly. So when Sony starts putting out games that use that much space, they will be worth it.
The pros of an xbox 360...
Well, the controller is much easier and better set up than the ps3's imo. But the real good part and WHY I purchased a 360 was for what I mentioned earlier, the firmware of the dvd rom can be hacked to play copied games. Which in the end will save you a fortune if you want to do such things. Rent and Copy is pretty easy. The hacking of the dvd is pretty easy, I just had to take mine apart again to update the firmware to the latest cause some games would not work. But to burn a 360 game all you need is a pc with a dvd/DL burner and an iso of the game.
You will want to buy two things to update the firmware if you decide to do this. It will cost roughly 40-60 depending on what kind you want. Its a connectivity kit and probe to hook up to your pc to flash the 360's dvd. There is a great manual with pictures that you get when you download the cutom firmware. Step by step instructions, easy as pie. And honestly taking apart the 360 is pretty damn easy too.
Now, the 360 has some great games, available on both systems, but imo graphics are moot as both systems can do 1080p. Here is a list of games I loved for 360..
Rainbow Six Vegas 2
X-Men Origins Wolverine
Riddik Assault on Dark Athena
Guitar Hero/Rockband games
Star Ocean
FEAR 1 and 2
Spiderman Web of Shadows
Thats the small list...
PS3
Uncharted
RE5
Ridge Racer 7
CoD4
Hope this helps, need to tend to the child, so I will post more later. If you want to know more about flashing firmware, let me know, I will get you more info.