It seems clear that in the hands of a professional with no real Viper experience and several C&D editors, that The Gen V, as tested, could not be driven as quickly as the ZR1, as tested, on the track. From a marketing perspective, that is definitely not very good. I suspect that the Viper has the potential to overcome that with different tires and some suspension changes.
For those who just want power, I don't think that is the fix. Power is nothing without handling and honestly, if all you want is straight line performance, I think a better option is a solid axle car - more durable, and easier to make go straight under acceleration. The Viper is a SPORTS CAR and trust me, power is not the panacea. Weight (this car outweighs the ZR1) and suspension design and setup are key and I bet the latter can be adjusted some to get the Viper on par with the ZR1.
At the end of the day, though, the subjectives of style, feel, sound and so on are going to be very important in both cars. I have to give the nod to the Viper, and I am a Viper and Corvette owner. I have always hated that window in the ZR1 hood and the ZR1 also has too many tacked-on bits to look really integrated like the Viper.