Bungie is most likely done with Halo,
As much money as they make on that series... Done doesn't exist yet.
As far as the others are concerned, they were supposed to be exclusive, but after EA made one of their awesome (sarcasm) contributions to the video game industry... And it isn't that I don't like the fact they aren't exclusive, its that I don't like EA. They are an evil, evil corporation.
And Sony and the online play is still terrible on patches. I still go home and hear my brother complain about how an unbreakable hasn't been patched, or how come people are still able to get under the map. I have yet to encounter a lasting issue like that on the 360. Biased? Maybe. Based on experience? Completely.
If it was 3-5 years ago, with the likes of Bioshock, Mass Effect 1, Halo, and others being 360 only, I would say that hands down. But it isn't. Sony is getting more and more titles (thanks again, EA!) and they still have the built in blu-ray. Not to mention God of War is fantastic, and Gran Turismo is due to launch (finally)
And if you had plans of putting Linux on your ps3 (I did, and then they stripped users of that ability), you may want to look into that some more.
Exclusives-
Exclusives- Draw. Mass Effect isn't due out till January, Allen Wake, Fable, Gears of War, Splinter Cell, and Crackdown are all 360 exclusive. And some of those are/were fantastic games and series. The ps3 has God of War, Socom, LittleBig Planet, Resistance and Killzone to back its list of exclusives. I like some of both lists, and neither list enough to give it an edge.
Controller-
Draw again. I like the feel of the 360 controller. I have a plug n play and a usb controller. they both have their uses and accomplish them well. The ps3 controller isn't as easy to use on a computer, but it does have a built in battery as a wireless. The move and kinect controllers are due out soon, and those may swing this one way or another.
Console-
Slightly ps3. I've had a 360 get the RRoD, and my brother has lost 2 ps3's to the YLoD. Both have high failure rates (ridiculous if you ask me). I liked (notice past tense) the fact that I could put linux on a ps3, but that ability was taken away. The ps3 still has a blue ray, and that may be an edge to some people.
Online-
Xbox charges money, ps3 doesn't (unless its a pay to play, and EA has "plans" for those). I like live, I like the frequent updates and patches, and all of my friends are there. I'm going to remove myself from this one because of bias.
It all comes down to what you want out of it and what your friends have. We share games all the time, so if I had the other console, I'd be boned.