Between the two, I'd go with Princeton. My favorite book, though, is The Real ACT Prep Guide. It's really the only book you'll need, and when it comes to a test like the ACT, practice pays off, and you want your practice to be as realistic as possible because practicing a non-ACT obviously won't help. Most of the book is dedicated to teaching you what you need to know for the test, and there's some real practice materials in the back.
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