Adam Peterson vs. Bill Powell — Career Comparison

On the career pitching numbers, Bill Powell posted a stronger line than Adam Peterson. Bill Powell posted stronger numbers in ERA (2.87 vs 5.46) and WHIP (1.406 vs 1.516). By the career numbers, Bill Powell had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.