I think it really depends on what region of the country you are in. When I was growing up in the SF Bay Area (Ca.), there was multitudes of styles and while there was some style bias, no one group really had a dominant position. Since I moved to the Nashville area, I've discovered most of the open tournaments in this area are very heavily Japanese-style oriented, especially wado ryu. Many of the judges are taught by their instructors and orgs. that if it is not their style's way, it is either wrong or at the very least, inferior.
You mainly encounter this in the lower belt divisions (y'know, the ones where the bias is most damaging to a student) though because many of the judges there only venture out from their closed tournaments (once again mostly wado ryu) only once in a while and are not as familiar with (or possibly don't care about) the rules of the open tournaments they are judging at. I have had my students not only not being awarded their points, but actually reprimanded for using round kicks and other circular movements because these are not allowed in the closed wado events. But these are the open events that these are perfectly legal.
You usually don't see it as much in the black belt divisions though. In spite of this, my wife was the top BB female forms competitor in the region and one of my (now) 4th dan students was the top male BB forms and weapons competitor a few years ago when they were actively out on the circuit. The main disadvantage ANY of us would have in sparring was getting DQ'ed for excessive contact, since how we normally spar in the adult black belt classes is a lot rougher than what they allow. At the bigger NASKA events, it usually goes back to what I grew up with in Ca., you may have some bias in individual rings, but there is enough diversity in styles that no one group has any real advantage.
oint and Olympic. The only differences are the rules.
