French or Spanish - which language will be more beneficial to learn?

It depends on what you want to do or what you are doing. But if you want to go with my suggestion I'll suggest you French, because French is very widely spoken in European countries and hence job opportunities in European countries will increase.

It totally depends on you, but, I will suggest you to take French language because. It is the second most widely learned language after English and the sixth most widely spoken language in the world. French is also considered to be the easiest language to learn.