Jonathan Aro vs. Joel Peralta — Career Comparison

On the career pitching numbers, Joel Peralta posted a stronger line than Jonathan Aro. Joel Peralta posted stronger numbers in ERA (4.03 vs 6.55) and WHIP (1.194 vs 1.909). By the career numbers, Joel Peralta 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.