I think the Corvette is faster because of the LS1 and for the reasons mentioned above, but I would get the 08 GT simply because it is much newer and a twin screw blower on top makes 450+ rwhp in a blink. I owned a 10 sec 99 GT that I drag raced for years and I absolutely loved the car. However, after going for a ride in an 08 C6 Corvette with the 6 speed auto and LS3, I have to have one.