personally as a PS3 owner ill say this. im glad i got a PS3 instead of a 360 cause i was seriously thinking about getting a 360. sure, with a PS3 i miss out on Halo, Gears of War, and some other games that look pretty fun. BUT, with PS3 my online gaming is FREE (not as amazing and easy to use as xbox live but it works), i have a BluRay player, AND, no stupid Red Ring of Death.
for me, the BluRay capabilities was a huge buying point.
if you do lots of online gaming then stick with the 360. more people on xbox live and its just waaaayyy better.
plus the exclusive titles on the 360 are better just now and since it came out first and more people have it, its the priority console for games developers. (thats why you wont get huge delays between release dates like you did for the xbox and the ps2).