I would say schedule your top choice after your first interview. The first interview is always the most nerve wracking, so answers to questions don't always seem to come out as intended. Maybe you notice you speak too quickly when nervous, ramble on, or don't have the common questions answered as well as you would have liked. Point is, use that first interview to critique yourself and go over what went wrong and get better from there. You'll also find that the interview day isn't actually that bad and that the school is trying to sell themselves to you as much as you are trying to sell yourself to that school.
Personally, I scheduled an interview at a school I didn't care too much for before a school that I really wanted to get into and got accepted. Using that first interview to get all the kinks out of my interviewing skills and mindset definitely helped.
