Both really nice cars, I also considered the Challenger when I was shopping last year. My biggest gripe, and it wasn't against the car itself, is even up here in Northern Maine, there are Challengers EVERYWHERE.
At any given Cars & Coffee or car show, there are 10 Challengers to every Camaro or Mustang. At the last one I went to, I could have opened a Dodge dealership on the spot
Both great cars though!