Which game should I buy first for my new PS3? Portal 2 or Little Big Planet 2?

-I like both games, but if I had to choose between which one, which one should I buy for my first game?definitely Little Big Planet 2. It's fun and easy to pick up on, like a first game should be. I've played Portal 2 before and it's an awesome game, but there's not much to do after you've finished it, and most of the time you just wanna chuck your controller at the wall. I'd suggest other games too like GT 5, MAG, or even Uncharted which i think really demonstrate the capabilities of the system. but make sure you've got an hdtv... it's essential, lol
I've never played the little big planet series, since I have Xbox, but I absolutely love portal. It has a great, entertaining storyline and even some twoplayer maps over live (psn). Although once you beat the single player and get all the achievements theirs not much else to do -_-
Portal 2
Portal 2
Runespell: Overture
LittleBigPlanet 2
littlebigplanet 2