I sugguest you to seach this question on the BaiDu or Google, there are a lot of people ask the same question like you. Before I decided to learn the Spanish, I have the same question. Now I choose Spanish. For 2 reason:
1, It is simple...by far this time (I learned Spanish for 1 month), I do think it is very simple, especially when the English words get you so much trouble...the spanish word seem very easy to remember, as long as you read it correctly.
2, Who speak the language: as far as I know, people in all the South America, the USA, the Spanish and some Europ coutry speak Spanish; people in most of the Africa, Canada, France and some Europ country speak French. You can decide people from where you prefer to communicate with