Michael Petersen vs. Steven Shell — Career Comparison

On the career pitching numbers, Steven Shell posted a stronger line than Michael Petersen. Steven Shell posted stronger numbers in ERA (2.45 vs 5.02) and WHIP (1.127 vs 1.593). By the career numbers, Steven Shell 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.