Jonathan Aro vs. William Sullivan — Career Comparison

On the career pitching numbers, William Sullivan posted a stronger line than Jonathan Aro. William Sullivan posted stronger numbers in ERA (4.5 vs 6.55) and WHIP (1.667 vs 1.909). By the career numbers, William Sullivan 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.