How's about faze the other instructor in and then in a couple months majority of your lessons would be with the new instructor and then it won't be such a big thing for your old one? Also consider having lessons with both. Every other lesson with the new instructor. Then you could get the best of both. It all depends on you because some people get confused with too many conflicting opinions. I have 2 instructors because the one really helps boost my confidence and the other is like a drill sergeant which helps me improve. They are both equally important because you can't have only skill and no confidence and visa versa.
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Hi, so I think you should just say that you had a very good experience with the instructor you liked and that you would love to have a lesson with her again as u feel it is nice to change routine to keep things interesting!