Horacio Estrada vs. Bill Williams — Career Comparison

On the career pitching numbers, Bill Williams posted a stronger line than Horacio Estrada. Bill Williams posted stronger numbers in ERA (5.06 vs 7.5) and WHIP (1.313 vs 2.139). By the career numbers, Bill Williams 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.