Bill Butler vs. Ed Donnelly — Career Comparison

Looking at the career totals, Bill Butler and Ed Donnelly are fairly close on the surface numbers. Ed Donnelly posted stronger numbers in ERA (4.03 vs 4.21) and home runs allowed (0.41 per nine innings vs 0.99). Bill Butler had the advantage in WHIP (1.479 vs 1.534). 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.