By asking this question, the interviewer can understand several things about you. The first is your knowledge of databases, especially SQL databases. Second, your answer will also confirm if you have experience working with both SQL and NoSQL databases. The third thing the interviewer will learn is your ability to organize your thinking and present technology and options to the organization's business unit leaders. To demonstrate this, you should keep your answer direct and to the point and use simple, non-technical language when describing the benefits of each of these options.