There is no glib answer to this question, that covers all situations. That makes it even more important to prepare for the question, but to do so for every single interview. At the same time, listen to what the employer says during the interview, so that you can be flexible if necessary.
Think about what the employer is looking for. Also remember your demonstrable strengths, and match the two in your answer, if you can. So if you are joining a start-up, and can enthuse about your contribution to building up a business unit, they will be interested.
The trap is saying the opposite to what the employer wants. So talking about your freedom to use your own initiative and set your own procedures to a bureaucratic or process driven business may lose you the job.