No, I am not going to break down their play in the first preseason game, I have something a lot more scientific.
I simulated them in Madden! Below are the highlights from a Lions team helmed by Culpepper and another one helmed by Stafford. I ran the entire season without any interaction by me. Conclusions follow:
4th place NFC North
Green Bay Wins NFC North
Pats beat Cards for the Superbowl
Culpepper: 78 QB rating/2433 yards/14tds/17ints
Kevin Jones: 884 yards/3tds
Calvin Johnson: 1217/ 8tds
1st place NFC North (beat GB on tiebreaker)
Won wildcard game against Eagles
Lost Division Game to Seattle
Pats over Seattle in Superbowl
Stafford: 90 QB rating/2751 yards/ 20tds/11ints
KJ: 981 yards/ 0 tds
CJ: 1254 yards/11 tds
Well, there it is. No more arguments. Madden has spoken. Stafford should totally start as QB of your Madden franchise.