From Quora: My answer to "Do you prefer The Princeton Review or Barron's Books?"

https://www.quora.com/Do-you-prefer-The-Princeton-Review-or-Barrons-Books/answer/John-Linneball

I prefer the Barron’s SAT book - it provides more detailed analysis of the math, etc., needed for the test, whereas the Princeton SAT books seem to focus more on tricks and not the substantive math. Barron’s is maybe slightly less effective at presenting the “tricks” you can use to solve problems faster, but only very slightly. As far as other subjects are concerned, I don’t know, but generally, I’d go with Barron’s, simply because they don’t run a review course, and thus, have no incentive to withhold any information from their books, whereas Kaplan, Princeton Review, etc. would all rather you pay for prep courses than buy books from them. That’s why I use the Barron’s books with my SAT prep students.