^I’ve done them all – CFAI, Schweser, FinQuiz and even a few others.
When I say that I’ve done 20 practice exams (full disclosure: I was a re-taker), I’m not exaggerating. And I have to say that CFAI are better (or more representative of what you’ll see on exam day) by a fair margin. Schweser and FinQuiz are about equal to each other and also good for the sake of practice – if I had to rate them, I’d say 6 or 7 out of 10. But when I was reviewing my practice exams in the final 10 days, I spent *significantly more time* going over the CFAI exams from prior years as well as their practice MC questions.
(And glad I did it that way, too.)