This is an interesting debate that bugs me in so many ways, lol. No offense meant to anyone for what I may say that you might not agree with or like!
First of all, it has always bugged the hell out of me that people like to take the top of the line car from whatever manufacturer, and put it up against a popular but not top of the line Corvette. Why do people do this so often?
Secondly, I have a hard time understanding why these cars are compared against one another when they are completely different beasts. The Corvette is a proper sports car, and even though the Hellcat has a lot of power, it is a grand touring car. In any other tests besides a straight-line drag race, the Corvette will dominate significantly. Straight line performance is just one tiny aspect of what a car is capable of, and I think it is silly to use this as 'the' measuring stick. Oh well, who cares? Which one is faster?
The video is interesting, and the guy is very unemotional (which is great), but he also talks a lot of nothing and gives no conclusion. In the first race he acknowledges that the Z06 has problems off the launch, and beats it by a couple of car lengths. There is no real explanation of what happens in the second race (other than that the Z06 seemed to get a bit of a 'jump'), but the difference was several car lengths.
We can argue statistics all day. The Corvette is lighter, and has a better power to weight ratio. The Hellcat has more power and more importantly, more torque. It is another age-old argument that the lighter car with the better power to weight ratio has the advantage, but the extra weight makes a significant difference on the Hellcat getting traction. Trust me, I've been there!
While I do think that this video is inconclusive, I will say that when dealing with these kind of power levels, it literally comes down to the driver and their knowledge of their vehicle and their ability to get the power down effectively.
And THAT is a much more difficult thing to do than clicking on a video link. LOL!
Give it a try. I did.
Me versus a 2015 Hellcat Charger: