Shula's 2013 offense produced at a higher level than Chud's 2012 offense. With virtually the same personnel.
Shula's 2013 passing game produced more touchdowns, less turnovers, and a better first down conversion percentage than Chud's 2011 passing game. Chud's passing game produced more yards though. So, you would prefer more yards and less of the rest?
Here is the difference. In 2011, the Panthers running game put up the points and Cam ran for several red zone touch downs. The red zone was open for the run game. The difference was the Panthers had multiple red zone threats in the passing game and forced defenses to spread out and use all of the field. This gave cam and the running backs more lanes and options to get in the end zone.
2011 Red zone passing threats: Greg Olsen, Jeremy Shockey, Legedu Naanee, and Brandon LaFell
2012 and 2013 red zone passing threats: Greg Olsen and Brandon LaFell.
2014 red zone passing threats: Greg Olsen, Kelvin Benjamin, Jerricho Cotchery, Ed Dickson, Marcus Lucas, and Brandon Williams
I have made previous posts showing the successful scoring offenses have 4+ red zone passing threats. A teams ability to strengthen the running game by weakening the defenses ability to defend the run in the redzone is the difference. Always has been. Defense, field position via special teams and red zone offense is what wins championships. Rack up all the yards you want anywhere else on the field, but when it comes down to it the team that can play the best in a 20 to 30 yard box will win it every time when the best play the best.