Jonathan Aro vs. Bobby Parnell — Career Comparison

On the career pitching numbers, Bobby Parnell posted a stronger line than Jonathan Aro. Bobby Parnell posted stronger numbers in ERA (3.82 vs 6.55) and WHIP (1.485 vs 1.909). By the career numbers, Bobby Parnell 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.