I personally have both the Princeton Review copy as well as the Barron's copy.
Take my word for it; go Barron's for this one.
1) Barron is much more structured, informative, and insightful.
2) Barron contains more checkup practice problems on the way.
3) Princeton Review somewhat skims over the more fundamental elementary concepts.
However, if I assume correctly, and the sole purpose of you taking the AP exam is to add one more 5 to your belt, then I suppose PR
will do the "trick", if you will.
I highly not recommend students self-study AP courses just to prove to college admissions they've done it, if they do not like the subject in the first place. You are taking time out of your daily itinerary to take this. At least enjoy it.
Remarkably, AP Macro/Microeconomics is not only incredibly applicable to real life (easy enough as it may be in comparison with more collegial approaches), it is also fun.