Spencer Arrighetti vs. Boof Bonser — Career Comparison

On the career pitching numbers, Spencer Arrighetti posted a stronger line than Boof Bonser. Spencer Arrighetti posted stronger numbers in ERA (4.69 vs 5.18) and WHIP (1.409 vs 1.471). By the career numbers, Spencer Arrighetti 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.