Brian O'Connor vs. Pat Simmons — Career Comparison

On the career pitching numbers, Pat Simmons posted a stronger line than Brian O'Connor. Pat Simmons posted stronger numbers in ERA (3.67 vs 5.11) and WHIP (1.526 vs 1.865). By the career numbers, Pat Simmons 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.