The answer will depend on where you are in your career. If you are new, then you want to gain more experience and learn a wide variety of things. If you have a lot of previous experience, you might want to find something challenging and more opportunities for growth.
This is a stronger answer than the generic one about learning and finding something challenging. This answer displays a lot of experience, ability to work hard, and the ability to deliver items quickly. This person answers by saying he wants to find a position where he can use more creativity, while showing off his credentials as a good worker.