Thanks for a good question, but you didn’t say enough about what you really would like to do in the future. If you are interested in pharmacy, then a Master of Science would be more useful. (I don’t know whether this alone would qualify you as a pharmacist, but it certainly would give you a good background for taking any professional license exams.) If you think you would like to keep your options open for a broader range of careers, then engineering management might be the better alternative. I suggest you talk with some of your professors about this also, since they already know your strengths. And know that you will always keep learning as you move forward in any career, and will get to know your own interests better as well.
Many good wishes!