When it comes to benefits, it pays to go big, as in the MBB. This year, BCG grabbed the top spot in benefits, rising by nearly .20 of a point. McKinsey and Bain rounded out the Top 3. Last year's top performer, Putnam Associates, slid down to 7th. Worse, the Keystone Group, which placed 5th the year before, tumbled all the way to 13th.