Frankly, I believe the majority of people who bought the Mustang over the F-body did it for three reasons. A. the Mustang looked better on the outside, B. the interior on the F-body cars was too 80s, C. a Mustang GT (although slower) offer the amount of HP & TQ the consumer actually wanted. The Mustang had a gradual increase in power. base 190hp & 220tq, GT 260hp & 302ft-lbs of tq, Cobra 320 hp & 317 ft-lbs of tq vs. Firebird/Camaro base 200hp & 225 ft-lbs of tq, Formula/Z28 305-310 hp & 335-340ft-lbs of tq, Trans-Am WS6/SS 320-327 hp & 350ft-lbs of tq. The insurance was lower on the GT and people went with that. Plus the Mustang was more comfortable to ride in as a daily driver.

The Challenger will probably be more comfortable, looks better, has better interior, and I bet will have better acceleration; however, I bet the insurance will be worse unfortuneatly.