Varying styles of steppin' IS REGIONAL, as is all other factors of greeklife. I will say that there are some steps that you find ALL frats doing at some point when they're on stage.
On another point, I will say that I find some of the statements on the origin of steppin' to be bullshit; and I feel this way because at this point in the game, who can prove their statements, and how? Some of these people out here talkin' this shit crack me the fuck up!