Well, who knows really? The 360 is a successful console, and it has some good games. It might be getting late in the 360's lifecycle though, so there could be the chance that if you buy one now that it might be going to be replaced by a new console from Microsoft sooner than you would like. On the other hand, the PS3 hasn't been as successful (leading to talk that it is not doing that great), it has some games that are probably better than anything on the 360 (though not as many good games overall, and it doesn't get some of the big exclusive dlc that certain games on the 360 get), and if it gets retired earlier than expected, then you would be in the same boat as if the 360 was replaced.
I guess the 360 wins with a bigger library of good games, achievements which make even old arcade games like Ms. PacMan fun again, better arcade games, and the same technological performance in games at a lower price. But, if you are a bit of a movie buff, and still have faith that Sony is going to bring out some good games, then the PS3 could also be a good choice. And, it's probably still better to buy a PS3 with blu-ray (and backwards compatability with PS1 and PS2 games if you can find one in mint condition than to buy a stand alone blu-ray player and a PS2 this Christmas, then wait to buy a PS3 later.
Heavens to Murgatoids.
