Jonathan Aro vs. Glen Perkins — Career Comparison

On the career pitching numbers, Glen Perkins posted a stronger line than Jonathan Aro. Glen Perkins posted stronger numbers in ERA (3.88 vs 6.55) and WHIP (1.309 vs 1.909). By the career numbers, Glen Perkins 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.