I disagree on the build quality part. I test drove both cars back to back more times than I can count when I bought my SS. I thought the Mustang was much more fun to drive but my wife preferred the camaro because it was a little more comfortable and nicer on the inside. The interior materials on the camaro seem to have a better fit/finish IMO and the car feels much more solid when going over bumps, every day driving. My wife's parents own a Ford dealership and she has never owned anything but a ford but she preferred the ride, interior, and comfort of the camaro so much that she was willing to forgo the employee discount we would have received on the mustang.
I can't argue on the visibility part.
As far as practicality goes, that was a tie for me. The mustang is a little smaller and a little less comfortable for long drives and the back seats have a 50/50 pass through. But, the back seat is two buckets so you can't put a car seat in the middle. The camaro's visibility sucks and the trunk is nearly inaccessible. However, you can put a car seat in the middle without sacrificing front leg room and its roomier and a better GT car so practicality is a toss up. Unless of course you are over 6ft tall, then the camaro's lack of headroom becomes a problem.
I stand corrected before you. Picked up an issue of Car and Driver while I was waiting for a haircut and they liked the Camaro quite a bit better than the Mustang.