Whoever you end up flying with, make absolutely sure that your flight instructor gives you a copy of the Flight Training Syllabus he or she will use during the training. You have a right to know exactly what you will be working on, and know the sequence of training activities. Read the syllabus. It must contain the elements of each and every flight lesson you plan on taking. If your flight says something like "Ah, I've got lots of experience, I'll decide what you'll work on and when..." then you should politely say "Thanks." and find another instructor who has a written plan of action. This will save you money through the course of your lessons, because you can then prepare for each lesson. Beware of flight instructors who do not charge you for ground time before and after each lesson.
Expect to pay for at least 2/10ths of an hour before and after each lesson, otherwise you are probably not getting the best instruction. I've worked for both kinds of flight schools, and I know the difference. I've seen students loose interest in a program that was not structured, and I've seen students who were propelled through a formal regimented FAR Part 141 program who were mediocre pilots. The best combinations of student pilots and instructors have always met through a process of researching each other, and making a commitment to attain the goal of getting certified. Each step of this goal must be documented by a written plan of action, or outline.