Go with Japanese, Korean is over-rated. Japanese always will have the better technology for games, so whenever you go to Japan you'd be able to understand those games they have there!
But then again Korean is basically the alphabet, anybody over the age of 3 can learn it, it's so simple.
I'll give you a bit of advice. I'm not criticizing you, but if your only reason for learning the language are the reasons posted, you will NOT be persistent enough to learn the language. It takes a LOT of interest in a language to learn it, you have to immerse yourself(that's downplaying) in the language, not just audio or occasional practicing.
I where you're going, Loth - is it okay if I call you that?-. But, I think Abysmal was saying to be totally interested in the language (which I debated about) you have to immerse your self in learning about the country and the language and cherishing it so that you would fully understand, and even have gratitude about that language.