Should i get a 2011 mustang v6 or a 2011 Camaro V6?
They are both excellent cars, both should be roughly the same performance and fuel wise. Test drive them both and decide which you like best. There are features and options that the mustang has that the Camaro does not. ( sync, glass roof ) Also check out insurance on both, sometimes it can be quite a bit higher on one than the other. Maintenance items should also be considered too, tires can be quite expensive if they are a unique size.
My personal preference would be for the Ford, I like the interior better.