“Defense wins championships,” goes the conventional wisdom, and it applies to football as well as basketball, and by extension to baseball (where it translates as pitching) and hockey (where it’s a hot goalie). And the New York Giants clearly have the better defense going into Sunday’s Super Bowl XLVI. Yet there’s another old gambler’s saying that applies equally well to the New England Patriots, who saw their pursuit of a perfect season four years ago dashed by the Giants in a Super upset: “In the rematch, bet on Goliath.”