Jonathan Aro vs. Pedro Viola — Career Comparison

Looking at the career totals, Jonathan Aro and Pedro Viola are fairly close on the surface numbers. Jonathan Aro posted stronger numbers in ERA (6.55 vs 7.5) and home runs allowed (1.64 per nine innings vs 4.5). Pedro Viola had the advantage in WHIP (1.667 vs 1.909). By the career numbers, Jonathan Aro 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.