Both are amazing muscle cars. I chose the ZL1 because of its uniqueness, track capabilities and strangely enough the dominating exhaust note. My city is overrunned by mustangs, therefore, a ZL1 was the perfect choice. Makes driving more fun. And a black, ecf, zl1 looks absolutely sinister, i wasnt a fan of all those gt500 boyish decals and stripes. Comparing with my brothers mustang, the build quality of the camaro is in my opinion is much more solid, however the paint is much better on the mustang. The zl1 drive is great, very sharp, and tight. The mustang has a good drive but somethings missing. Each person has their opinion, you are new to mustangs and camaro and the only way to really appreciate one or the other would have been to grow up with them.( either family or friends had one or you had previous models)
One last note you made the best choice !!!!! (my biased opinion)
the all mighty ZED.