If you are asked how will your past experience help you do better in this position, what you want to do is show the employer the specific requirements that they have for this job. And then outline how each of your past experiences line up. So to do this right make sure you look at the job description for this new position and then basically jot out exactly how your previous skills align to that job and as you answer this question just run through the list and say, "You need A, well here is my experience with A. You need B well here is my experience with B. You need C well here is my experience with C. As you can tell based on this past work experience I am bolstered for this job based on your requirements and needs.”