Jonathan Aro vs. Jim Peterson — Career Comparison

On the career pitching numbers, Jim Peterson posted a stronger line than Jonathan Aro. Jim Peterson posted stronger numbers in ERA (5.27 vs 6.55) and WHIP (1.665 vs 1.909). By the career numbers, Jim Peterson 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.