Go figure, the teams that play in the league where the pitchers hit have a way better ERA. But, as I said, it is almost all park factor. Offensively they are very similar, the difference is defensively Braun is average, Willingham is horrible. You are overvaluing RBI and Runs, as those are a factor of the guys playing around the hitter as much as the hitter themselves and WAR does it's best to be context neutral.