Do they allow for a new diff? A good lsd would be a must in either if allowed.
I think the camaro would be the better all around (of course I’d say that), however the mustang has a strut type front suspension and you can better negative camber from it (stock). If you can do any adjustable suspension parts up front, or even offset bushings, you can claim that back on the camaro.
Part availablity is awesome for both. The v6 camaro’s are cheap. The v6 is a great motor (gm 3800) .