Tony Arnold vs. Billy Wagner — Career Comparison

On the career pitching numbers, Billy Wagner posted a stronger line than Tony Arnold. Billy Wagner posted stronger numbers in ERA (2.31 vs 5.06) and WHIP (1.027 vs 1.685). By the career numbers, Billy Wagner 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.