Which language is much better to learn.Korean or French?
French is spoken in a greater number of countries (France, Canada, Sth Pacific, parts of Africa) it's also one of the key European languages, used as the second language for the Olympics AND Eurovision (!!) It is also tres tres sexy.
French! and is also easier to learn!
It all depends on what you plan on doing with that knowledge. Pick one that serves you best for that advantage.