For kicks. All stats are 2016 models and pricing:
If it were purely a case of HP:$, or Power:Weight, every enthusiast would drive the same car. Given the high number of Mustangs on the road these days, we can see what's driving a lot of people's decisions, and we can expect that to tip in the favour of Camaro purely on power per dollar, and even power:weight ratios.
It depends on what we consider valuable.