360 = PS3

Back in the day, exclusives were what made the system. There weren't just a few first party titles separating on console from the next. The N64 had plenty of great games that you couldn't find anywhere else (maybe due to the cartridge format, maybe due to the fact that relatively few third-parties made stellar N64 games, with Rare being the most notable exception). Now, the Wii has the original games (mostly crap - games don't down-port well), while the big boy systems are virtually identical. PS3 has Blu-Ray, Killzone, Uncharted, Ratchet & Clank, and Metal Gear. Xbox 360 has Xbox Live, Achievements, Halo, Fable, and a lot of limited-time exclusives (Bioshock, Orange Box, GTA IV DLC, Rock Band). Besides this handful of games/features, the two systems are practically identical. Even the controllers are equal. (Although the innovation factor goes to Sony for popularizing the dual sticks with the first PlayStation back in the day... remember Ape Escape?)

When you can play the same games on either system, you have to buy a console for the one game you really really want to play, or you get the one your friends have so you can play online with them, or you pick the one that's cheaper (360), or you pick the one with Blu-Ray (PS3), or you pick the one with achievements. Achievements are in every 360 game and are probably the biggest reason multi-platform games sell better on Microsoft's system every single time. Try to ignore them, if you can. But who would have thought something as simple as a Ba-DOOP could help Microsoft pull far, far ahead in the console wars?