This is tricky question, as money and success both are important and you cannot outweigh the importance of one over the other. Personally you might prefer money over success or success over money, but it is better to be neutral when answering this question in an interview:

You can say, that money and success both are important for you, but if you have to choose you would choose success. The reason being, if one is successful money often follows and you need not focus on money over success..