I found that Kaplan had the most comprehensive layout to show you your skill levels in each area, as well as trends and exercises to improve your weak areas. But you will pay significantly more for those tests... but they will come with great study material also if you get the course. In my own studying Kaplan really helped me out. Remember though, to get great statistics, you will have to take a least a couple or few practice tests for the statistics to start showing trends. As far as the
GMAT Club Tests, they will have some of the most challenging problems and can really help take your quant scores to the next level. As for
Manhattan GMAT, these are considered to be accurate, inexpensive, and a good option... but lack the study material and quick access to improve your weaker areas (unless you own the 8 guides of course). As for Princeton, I'm not familiar with their tests... Here are a list of all the tests available:
all-gmat-cat-practice-tests-links-prices-reviews-77460.html?fl=menuDon't forget the GMAT prep tests! These are the two most accurate practice tests available, so use them sparingly.
Good luck!