Spencer Arrighetti vs. Bob Smith — Career Comparison

On the career pitching numbers, Bob Smith posted a stronger line than Spencer Arrighetti. Bob Smith posted stronger numbers in ERA (3.94 vs 4.69) and home runs allowed (0.53 per nine innings vs 1.35). By the career numbers, Bob Smith 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.