This question aims to separate the leaders from the followers. If you were good at using your initiative and being self-directed then you would be different in approach and appeal from someone who prefers closer direction, routine, and more regularity. By stating which type of job, you prefer the interviewers would be able to see your potential development while gauging your personality and ambitions more accurately. Be clear about which would suit you so that you would then be placed in the right environment for your growth. For example, if you were easily bored, then a changing routine would be much more appropriate to motivate you. Your response here could help place you when assigning tasks.