From watching BOTH games quite closely (and enjoying them immensely) I think that the Lions are by far the better team. They played VERY hard the entire game, and if it werent for turnovers, the disparity really wouldnt have been that great.
Green Bay pretty much layed down in the second half. Detroit really played tough but kept shooting themselves in the foot with penalties. Also, Kitna played pretty great. He had no picks and was much much more accurate than Brett was. Also their defense is a carbon copy of chicagos, so they will know how to exploit you guys a little bit by watching tape of the Bears/Packers game.
Also, the game is at Detroit, for whatever that is worth.
Now, if Brett can have one of those magical (lucky) games you never know what could happen. Pack could blow them out by 50, but Im convinced that if BOTH teams play their best, Detroit is the better team. Better coach, better scheme, better athletes, homefield advantage = Detroit by 10