Home-field advantage

The Rockies have felt right at home at Coors Field, going 51-24 there this year. Paul Jasienski/Getty Images

One month ago, the San Diego Padres sat comfortably in first place, five games ahead of the San Francisco Giants and 10 up on the afterthought Colorado Rockies. In mid-September, though, we find the Padres and Giants in a dead heat for first and the Rockies rapidly closing in on both.

Thanks to the Rockies' recent surge, Troy Tulowitzki and Carlos Gonzalez are being mentioned in early MVP debates. How can we compare Tulowitzki and Gonzalez to sluggers like Joey Votto, who has better offensive numbers but less value on the defensive side?