ITR and GTS i think is a Driver's race with the edge to the ITR because of its LSD. Other than that, i think if the driver's horrible, you'll lose.
GSR on the other hand... GTS can take anyday. Theres a whole thread about this at nc.or-g ...
Oh yeah, in that magazine, those driver's were probably average driver's at best. They probably shifted at the usualy 7800 RPM rather than the 8400 Mark, so NOT landing lift.