Mike Birkbeck vs. John Mitchell — Career Comparison

On the career pitching numbers, John Mitchell posted a stronger line than Mike Birkbeck. John Mitchell posted stronger numbers in ERA (4.35 vs 4.86) and home runs allowed (0.53 per nine innings vs 0.9). By the career numbers, John Mitchell 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.