I can never remember the company names for some reason, but want to say I used both AATBS and Academic Review. I recall one providing significantly more depth in its materials than the other, to the point of being overkill. And I agree with WisNeuro--just stick with what's worked best for you in the past, if you've gotten that figured out at this point. Personally, I found taking multiple practice exams (as in, 4-5/week for the two weeks prior to the test) and reviewing the answers/rationales to be the most high-yield part of my test prep.
Edit: Looking at T4C's post below, I'm guessing it was AATBS's materials that were (IMO) overly in-depth, meaning I preferred the stuff from Academic Review. I did like AATBS's practice tests for the fact that they were tricky, though; I always prefer my practice exams to be more difficult than the real thing.