to say that one fraternity is completely dominant i think would be ignorant. Most fraternities to my understanding are dominant in their founding areas mostly and then are strong in other areas as well, its a regional and local thing.
SAE for example was founded at Bama, and they are very strong in the SEC schools, i haven't heard much from them in the Northeast, but they have a strong national presence.
I think every fraternity has their "stomping grounds" so to say where they have been strong and will stay strong... but for the most part fraternities like Sigma Chi, Pi Kappa Alpha, Kappa Sigma, Sigma Alpha Epsilon, Sigma Phi Epsilon, etc. (not trying to leave anyone out but you get the idea) will for the most part atleast be decent at schools where they are because of the big name.
I know at UVA though fraternities like St. Elmo's Fire which is an extremely small GLO is pretty dominant.
it all comes down to what school or region in particular we are speaking about.
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