Mike Birkbeck vs. Ed Donnelly — Career Comparison

On the career pitching numbers, Ed Donnelly posted a stronger line than Mike Birkbeck. Ed Donnelly posted stronger numbers in ERA (4.03 vs 4.86) and home runs allowed (0.41 per nine innings vs 0.9). By the career numbers, Ed Donnelly 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.