Ian Anderson vs. Adam Peterson — Career Comparison

On the career pitching numbers, Ian Anderson posted a stronger line than Adam Peterson. Ian Anderson posted stronger numbers in ERA (4.22 vs 5.46) and WHIP (1.381 vs 1.516). By the career numbers, Ian Anderson 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.