I saw the pic you entered into the "rivals" comp. I thought it was way to soft, while the lights and rims stood out too much. But anyway, the Cobra R, when it was new, competed against the 385hp Z06 and the GTS. Obviously the GTS was quicker than the other two, but the Cobra R handled and brakes just as well. So the shot with the GTS next to the Cobra R actually would be more appropriate.
Even though they don't have a "new" Camaro out, I think the Mustang GT would have been a better rival to the SS. Either that or a shot with the Cobra R and the Z06. The latter would have been the best rival for the Cobra R.