Upcoming series with the Cards will go a long way in determining this. I think that the Cards have the much better batting lineup. Brewers pen is a liability, as well. IMO, Sabathia is the main reason for the Brewers 3.5 game lead currently.
I'd prefer to see the Cards make it in.
I think that the Brewers would lose a series to any of the Phillies, Mets, D'Backs or Cubs.
Cubs won't be denied the division crown.
I'd say they are clearly the best NL club at the moment.
Mets (in particular) and D'Backs are a little weak in the bullpens.
Phillies are a factor if they continue hitting.