It is possible to do a comparison of basses with the same rig - and some will have more inherent booty than others (eg I have done the experiment with my current basses running through the same rig at the same club). The problem with this thread (and most on TB) is that there generally isn't context about someone's experience. I've seen plenty of people pontificate about their opinions on gear and related topics only to see a later thread where they'll admit that they have only owned one bass and never play out. That doesn't mean they shouldn't have an opinion, but it certainly isn't likely to be a very informed one...