I'll get this one started. All things equal (condition, originality, paperwork, features, paint color, transmission, provenance, etc.) Camaros will have a higher market value. How much? I would say the Camaro would be about 20% more, i.e. a theoretical Chevelle L78 selling for $70K would compare to a similar Camaro at $85K. This is a comparison only not a market analysis.
O.K. now, let me step out of the frag pattern here

... let her rip fellas!