I've played a fair amount on Xbox360 when I lived with my parents. Only thing I ever wanted to play on it was Halo. I didn't like Gears of war but who cares about this it's opinion based.
I only got the PS3 first because of my huge MGS4 fanboyism.
from there extended more games. and I'm even more glad with my purchase now than I ever was because unlike my brother I've never had to send in my PS3 and I treat that thing like shit. I leave it on 24hours straight at a time. Fall asleep with it on. ect ect ect. And for 5 years nothing bad has happened to it.
Also Xbox service being better? did you know Microsoft sent my brother apparently another 360 (From the broken models first gen) that he bought when he sent it in for his warranty. It's like Microsoft knew it would last just long enough the warranty would wear off. Because only about 8 months after the warranty was off, it red ring'd and my brother had to buy ANOTHER one. Now he has no problems though but that is some shady business dealing right there.
Xbox is a good system, IMO if you love FPS. Otherwise I believe you should go PS3 all the way for overall better experience. I don't know how people are claiming PS3 online is worse than Xbox. are we talking about little bitty options or something? or we talking lag? Because I never experience lag on my end on my PS3. I have lagless games after lagless games. Once in a blue moon it lags but I find out it's because me and a specific player are trying to play together. I notice absotluely no difference when i play with my brother online on Xbox360, than when I play PS3 online.
And ever since then, i've been nothing but satisfied with PS3 exclusives, (Xbox please try and make perhaps a non FPS good exclusive?)(Once again this is opinionated).
Also although my brother loves Xbox360, he's always wanted a PS3 because of our exclusives. MGS/Twisted Metal ect ect. but I've never once wanted a Xbox360. The only reason I thought about it recently was for the sole purpose of playing with some friends who are xbox exclusive.
btw PC gaming all the way.
EDIT: btw this is all my personal experience, I haven't done too much research myself besides playing on the second player port while my brother navigated through Xbox360 interface. So don't take anything I say as 100% fact. Most of what I said is personal opinion.
use to have a ps3 and when i compare psn to xbox live, live blows psn out of the water. interface is better, use-ablity is better. plus i dont recall microsoft having any security issues.
Read freyith's post.