Vipers in stock form run LOW 11's, high 10's. Z06's run mid/high 11's. Is TM really that bad on a Z06? I know on automatic GTO's TM was ****, but I didn't know the manual vettes had an issue. My 6-speed WS6 certainly doesn't have any TM issues.
I have not had the pleasure of driving a Viper, but I do know that 'vettes are very comfy, just bland as they are ALL OVER the place.
A bone-stock Viper will lay down around 540-550whp. A bone'stock Z06 is in the mid 400's. The C6Z will need a cam, bolt-ons, and tune to equal the Viper in horsepower, and then it's slight weight advantage and aerodynamics will put it out front.