John Patterson vs. Adam Peterson — Career Comparison

On the career pitching numbers, John Patterson posted a stronger line than Adam Peterson. John Patterson posted stronger numbers in ERA (4.32 vs 5.46) and WHIP (1.400 vs 1.516). By the career numbers, John Patterson 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.