I didn't vote simply because I wouldn't choose either unless forced. They both suck in comparison to PC gaming.
If I had to choose one, for whatever reason, I'd say Xbox 360. Pretty much all of my friends have it, the online service is much better (you get what you pay for), the exclusives are better imo, and it's just all around more enjoyable. The only things I would give PS3 are free online (as said earlier, you get what you pay for... PSN outage anyone?) and Bluray support. Even Bluray support is a gift at best imo because you need a 1080P TV to even take advantage of it, which the vast majority of people don't have. Plus any bonuses that come from the extra storage space offered for games is outweighed by the fact that nearly all games are designed for the Xbox 360 then ported over to the PS3/PC, meaning the majority of games see no benefit from Bluray.