Two things set Kaplan's book apart from the Princeton's Review's book. First, Kaplan's book tends to focus on methodical ways of doing problems whereas the Princeton Review's book looks more at shortcuts for solving problems. Which one you choose depends on your personal preference for solving problems. If you're the type who likes a step-by-step method for each problem, Kaplan is the book for you. On the other hand, if you would rather skip all that and just learn the quickest way to find the answer, the Princeton Review's book might be more suited to you.
The other main difference is the difficulty of the practice exams. Kaplan's practice tests tend to be more difficult than the actual exam while the Princeton Review's tests are a little easier. Again, which one you choose is a matter of personal preference as to how high you want to see yourself scoring before the real thing.
Consult the Game Plan to determine if you should buy one or both of these books.
