MGMAT's course is much more expensive. Talk to them personally and request some sample video clips , if they dont already have them on their website. See if you like it. I have a lot of respect for
MGMAT, but you definitely want to make sure that its worth the money. I would love to review their course, but i dont nearly have the kind of time i had back when i reviewed GMAX's course.
As for GMAX, I think its really thorough and very well organized. i am sure you must have read my review on the club website. I definitely recommend it.
No matter what course you take, taking a course will only get you off to a great start. It is ultimately your discipline that will carry you past 700.
Praetorian