The Xbox. The 360 has much better connection, gameplay and online. You may have to pay for it, but it's worth the price. Next, how many people buy PS3 because of Blueray. They buy it to play games, and Xbox has a much better library. PS3 has got no exclusives in comparison to Xbox. No good ones. When i asked several of my friends, all they could name was Little Big Planet, Uncharted 2 and Killzone 2. They said straight up that other key exclusives, like Heavy Rain and Resistance are bad games. And even if they were good, Xbox still has so many more. Look, Halo, Gears of War, The Orange Box, Mass Effect, Fable, Splinter Cell, Forza Motorsport, Street Fighter, Alan Wake, Crackdown, Left 4 Dead, just to name a few. And these are Franchises, not single games.
Umm... you're wrong. If you have a ps3, give the exclusives a try. Uncharted is an epic game(s), God of War, depite the total lack of story, has ground breaking mechanics. Little Big Planet is interesting (and adorable), but it really is for a "creator." If you don't build levels, not too good. But, ModNation Racers is outrageous, Demons Souls is groundbreaking (Try it. You WILL fall in love/addiction), Valkyria Chronicles is probably the best Strategy RPG since Tactics. MGS 4, if you're into stealth games, blows every other one out of the water in regards to gameplay, graphics and story.
And Infamous is the most authentic, probable, and believable superhero game, ever. It's phenomenal. And 3d Dot Game Heroes was a really unique idea and, despite it not being the "best game ever," I'm really glad I have it.
The 360 exclusives you named are only half-amazing. Forza is the lead of driving-games, but GT5 is going to surpass it. Left4Dead really isn't that good of a game. It's fun, but it really does lack in a ton of aspects. Street Fighter is not an exclusive.
Alan Wake, though, was phenomenal, and the Mass Effect games are dope. Personally, I don't think fable is too good. Too short, and too easy to 100%.
Also, despite the press around Reach, I hate the new formula with the sprint, shield, jetpack, invisibility. I know that BRINK is all about classes, and i'm absurdly stoked for it, but Halo wasn't. Halo is an epic, neutral shooter. If you are getting rocked by somebody, the reality is they are better than you. With all the new "abilities," Halo isn't an equal shooter anymore, and, in my eyes, the end of my time with it.
Gears of War, though, is cool, despite the lack of a decent story (just like halo).
Actually... other than Mass Effect and Alan Wake, the 360 lacks in stories via exclusives. If you play Uncharted, you'll be really surprised by the accurcy, probability and plain ol' good fiction. Demon's Souls is really an inventive/thought provoking tale/gameplay, and Infamous has a serious storyline with interesting outcomes.
360 wins in downloadable games 100%. But the exclusives, currently, I think go to the PS3. There's more variety on the PS3 (Including RPG exclusives, though they're all horrible. Lost Odyssey definitly wins, still).
This post didn't have anything to do with Brink...
...Resistance!