I'd go with the Viper first. I ran some tests in Arcade using Kent's anti-autosave trick. 5 laps of Infineon, TCS only, A-Spec, difficulty 6, on Racing Medium tires. The Corvette, while very good, suffers from some understeer, which is increased with tire wear, as the front ones wear quicker than the rear. It also used just under 3 units of fuel (guage dropped down two units by lap 3). On the other hand, the Viper wears its tires more evenly, and slightly less overall than the C5R. Also, it used far less fuel, as it was only until halfway through the last lap that the second bar of fuel vanished from my gauge. I also won by a greater margin in the Viper, with almost the same line-up as against the Vette. Not the most scientific test, I know, but I drove the cars about the same way (which is hard
![Mischievous :mischievous: :mischievous:](/wp-content/themes/gtp16/images/smilies/mischievous.svg?v=3)
), and to me, the Viper won out.
So, while both good cars, I'd recommend the Viper. It handles better, wears it tires a better, and is more fuel efficient than the Corvette.