When it's in the air, you'll know what you're hoping for. lol.

In all seriousness though I've only been to NYC so I can't speak about LA. It was as you can expect, urbanized, fast-paced and messy but if you already live in a metropolis or big city then you must be used to that.
NY is the cultural center of the world as they say, but LA is also very interesting, Hollywood, the movies, etc which I'm sure are an interest of yours.
What do you study, yigido? Because if your major is anything related to entertainment, film, etc then the choice is obviously LA, but if it's finance or marketing, then it's NYC for you my man.