Chinese vs. Japanese

Okay so. I've planned to learn an Asian language, but I'm stuck between 2.

These are Chinese(mandarin) and Japanese. I know its sorta biased, but can you guys give me an indication of which I should learn?

I want to go to either country and teach english as a second language, but which would be more "opportunistic?"

Chinese will take a much longer time to learn. You'll spend 6 or 7 years learning the language without getting any real satisfaction out of it (unless not being able to read newspapers after learning a language for half a dozen years bring you satisfaction, in that case, GO FOR IT). Getting a job is easier once you master the language, though.
Japanese will be easier to learn, you might benefit more from it if you're a fan of "Japanese culture" (read: YOU LIKEZ DEM ANIME AND JAPGIRLZ), but it MIGHT be harder to get a job. I would go for Japanese because I'm a lazy bastard and because I know absolutely nothing about China.