SF's D so far is on their way to another subpar performance, would be the 4th in the last 5 games (only exception being the inept Cardinals). It's still early, but this is why I said don't be so sure ATL is the better matchup if we win tonight.
If the Ravens blow out the Patriots (or vice-versa) and the NFCCG ends up being a close game (esp. with Atlanta playing at NO) then the AFC team will be the favorite.