Which language is spoken the most in your area besides English? If it's Spanish, learn Spanish. If it's German, learn German. Are you wanting to visit or live in one of the countries that speak German or Spanish? If you are wanting to visit or live in one of the countries, then I suggest you learn that countries language. :)
Defiantly Spanish. You will use it more. I mean think about it, how many other people do you know that speak German? I mean if you want to teach German or become a translator then ok. But you will use Spanish more.
Where are you going living and what are you going to be doing? If you are going to be in the US, and dealing with people in the Western Hemisphere, Spanish. If you are going to be in Europe or dealing with people in Europe, either will work, but German is more like English, and maybe easier to learn.