I had a 2012 mustang v6 premium last year, now i have a 2013 gt premium and its absolutely 100 times better than the challenger
What are you personally looking for in the car? Speed, reliability, comfort? Are you getting the gt/hemi? Personally go for the gt, its a little more cash but trust me you will regret it if you dont buy it.
If youre looking for speed, the mustang has a better power to weight ratio, and a faster 0-60 time than the challenger.
If youre looking for reliability, fords service has always been helpful to me, even with the mods i did to my car which "voids" warranty, they turn the other cheek. As for the challenger... its a dodge lol, gds
If youre looking for comfort, theyre the same really. The challenger is a lot bigger though, which personally i dislike, its like a boat.
Also, there are a lot more parts places for mustangs than challengers from what i noticed.
Theyre both great cars, but it seems you already love your 2012, why risk the change?
If you have any mustang questions feel free to pm me. Car pic in my photos