okay firstly i wanna state my gaming background. Nintendo 64, dreamcast, playstation 2, playstation 3. so i may be biased in my decision.
Although the xbox 360 is a great console and it's menu is nice and tidy and online from what i've heard is amazing (although costs). You've gotta remember that its made by microsoft who rob you of whatever they can get. They charge for everything so when we can upgrade at anytime with firmware on our ps3 it's more likely to cost you an arm or a leg or a cup of sperm.
Xbox live is nice but not as amazing as a whole virtual hang out is going to be when home comes out later this year i think* and also its physics based (can't remember the name of it*) thing allowing you to create all sorts of wonderful things. which is something the xbox360 will never be able to use as the ps3 has 8 sub-processors and the xbox as far as i'm aware doesn't.
As for the rumble feature as mentioned above, sony resolved their conflict with the company who make the *rumble* in their controllers and they will also be soon to come out at what i'm sure will be a much more reasonable price than you would get with microsoft.
Another feature although this has gotten alot of stick as being a copy of the wii is its SixAxis controllers which is definitly something, although currently not brilliant.
I mean you've only got to read the article at the top of this thread to realise that microsoft are quietly conning xbox gamers.
Okay my lil bit done. HOME IS GONNA RULE!!! check it out! and watch this space - - > www .homebetatrial .com it's made my mind up defo
oh and as for games selection and game quality... check out the trailer for MGS4 (you might have to dl it to your ps3 thou) thats where i watched it! it looks awesome.