Tracy,
Each test prep company has their own philosophy, and those will be furthered by their staff teaching. Our Bay Area tutors, and those nationally, have to possess rigorous standards in order to work with us. This includes: track record of tutoring success, high scores in the tests they teach, ability to build rapport (not just scoring high), communication savvy, and ability to adapt teaching to the student, among other things. Since it's the individual teaching you and not the company itself, ultimately who is going to help YOU produce YOUR best score, it's best, among other things, that you:
1) Know what you're scoring NOW
2) What your strengths and weaknesses are,
3) What your timing and timeline are for getting a final score and applying to programs
4) Identify WHO will be teaching, what their track record is - - for many programs there is a one-size-fits-all model which works for many but not all - - Will that be acceptable to you?
5) Assess your needs in terms of points, mindset, strategy, timing/time management etc..
Ultimately, it comes down to what you're scoring now and what you'll need to score, and what is the most effective way for YOU to do this (including learning/study style and the time you're able to learn content/strategy/mindset.
Since I'm local, I'm happy to chat with you over the phone about this.
Best,