Jonathan Aro vs. Bill Sullivan — Career Comparison

Looking at the career totals, Jonathan Aro and Bill Sullivan are fairly close on the surface numbers. Bill Sullivan posted stronger numbers in WHIP (1.857 vs 1.909) and home runs allowed (0.43 per nine innings vs 1.64). Jonathan Aro had the advantage in ERA (6.55 vs 7.93). By the career numbers, Bill Sullivan 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.