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?"

For those who claim Chinese is no harder than Japanese, I'll ask the same question again - How many Chinese books have you read without a dictionary?
Most of the time, even after half a dozen years of intensive studying, you'll find yourself using a dictionary.
The lowest number of Kanji/Hanzi characters you need to know in each of the languages to be considered proficient does it no justice. You have to compare how it looks like in practice, and that's where Chinese sucks.