That doesn't make sense if companies have private sections then there would be no comparison because the the sections would be different maybe you mean private sessions. I don't think a decent comparison will be made until they are both on the exact same track at the exact same time. I would take either of them but i would rather build a s-chassis car that could hand both of them their asses ( yea I know thats the inner-ricer coming out ha ha). If I had equal opportunity to have the GTR or the Z06 i would take the GTR just to have something different.