It really depends on where you are, or where you plan on living. In Europe, I think it's probably Spanish or German. A lot of people know German, so it's easy to communicate with others. Same with Spanish. Mandarin probably won't be that useful in Europe. French is also pretty useful, but IMO not as much as Spanish or German.
What Language is Most Valuable to Learn
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It really depends on where you are, or where you plan on living. In Europe, I think it's probably Spanish or German. A lot of people know German, so it's easy to communicate with others. Same with Spanish. Mandarin probably won't be that useful in Europe. French is also pretty useful, but IMO not as much as Spanish or German.