Jonathan Aro vs. Red Swanson — Career Comparison

On the career pitching numbers, Red Swanson posted a stronger line than Jonathan Aro. Red Swanson posted stronger numbers in ERA (4.9 vs 6.55) and WHIP (1.587 vs 1.909). By the career numbers, Red Swanson 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.