The other guys pretty much have this covered but there was something I wanted to address in your original post.

When you stated that a lower brace height bow was more "advanced" I read it as "superior".......if that wasn't the case then I apologize but I have to say that a low brace height bow (under 7/6.5 inches) is not superior in any way, other than possibly speed/ke, to a larger brace height bow when all else is equal. In fact, if we look at forgiveness, accuracy and overall practicality ratings then a low brace height bow might be considered inferior for the average shooter, again, when all else is equal.