Jonathan Aro vs. Bill Campbell — Career Comparison

On the career pitching numbers, Bill Campbell posted a stronger line than Jonathan Aro. Bill Campbell posted stronger numbers in ERA (3.54 vs 6.55) and WHIP (1.411 vs 1.909). By the career numbers, Bill Campbell 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.