What is the best LSAT prep class?

I have heard Princeton and Kaplan are a waste of money. So I’m not even going to go there. Among the 3, Testmasters, Blueprint and Powerscore, which one is better? I am aware that many students love the Powerscore bible books, but how is Powerscore as a prep class? I’m on the fence and do not know which prep course to take since Testmasters, Blueprint and Powerscore are top tiers.

If you taken the class, did it help you? Which prep class do you prefer? How many points did your LSAT jump up to?

THANKS!!