Besides under center these teams both are extremely talented all over the football field especially on defense. The Packers run out the league leader in sacks, DE Aaron Kampman with 11 total sacks. They also have a linebacking cor of A.J. Hawk & Nick Barnett who have combined this year for a total of 163 tackles and both rank in the top 30 in tackles. Their 12th ranked defense is nothing to overlook, neither is the 7th ranked defense in the league, that of the Dallas Cowboys lead by their defensive backs Roy Williams, Terrence Newman, Anthony Henry, and Ken Hamlin who combine for 16 interceptions on the year. Henry who is tied for tops in the NFC with 5 (much respect to Redskin, Sean Taylor, may he rest in peace.)
Quick Sidenote: If you don't know Patrick Willis, first year linebacker for the San Francisco 49ers, he leads the NFL in tackles with 110 and covers the entire field like Ray Lewis used to 3 years ago. I say this because while researching defenses in the NFL, Willis is the name that comes up most, he is a beast.