Tuer,
If you go the Chevrolet Website and do a competitive comparison of the 2011 Camaro SS and the 2011 Mustang 5.0 GT you can see a side by side comparison of each of their specifications. If speed is what you are really looking for the 2012 Camaro ZL1 is said to go 0-60 mph in 3.9 seconds.
Good luck with your vehicle purchase!
Evan, GM Customer Service