It seems to me that some communication between you and your teachers is needed. Mostly because, while 3 lessons a week MAY help you, zero lessons a week may be the outcome of your initial 3. So in that regard, no, they won't help you. The bottom line is that you need to do what is best
for you. A teacher can respect that, or they are going to have a very tough time in business. However, with people involved, things can tend to get a little messy.
Each teacher can let you know the terms of their own business, and then you can better decide what you may want to do. With that being said, you obviously feel as though you get something from each that you don't get from the other (which is always true because of the individual nature of it all). If you have clear ideas about what you are looking for in a teacher, or what you are wishing to learn, give "the" teacher a chance to know, and provide that if they feel able.
While I understand having compassion and sentiment toward a person who has been of great help to you, all students eventually move on (or at least the relationship may change GREATLY) in one way or another, and that's just part of the business. You do not need to feel guilty about moving on, and you do not need to feel bad about doing what is truly best for you, whatever that may be.
Also, remember that you are not ever signing up with a teacher to find THEE way to piano playing (that is up to you and your lifetime pursuit of it all). At most, you are signing up to find
their way of piano playing, or at least their way of teaching it.
Keep us posted

m1469