Jonathan Aro vs. Leon Williams — Career Comparison

Looking at the career totals, Jonathan Aro and Leon Williams are fairly close on the surface numbers. Leon Williams posted stronger numbers in ERA (5.4 vs 6.55) and home runs allowed (0 per nine innings vs 1.64). Jonathan Aro had the advantage in WHIP (1.909 vs 2.160). By the career numbers, Leon Williams 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.