Luis Arroyo vs. William Parson — Career Comparison

Looking at the career totals, Luis Arroyo and William Parson are fairly close on the surface numbers. Luis Arroyo posted stronger numbers in ERA (3.93 vs 4.92) and WHIP (1.440 vs 1.856). William Parson had the advantage in home runs allowed (0.6 per nine innings vs 0.98). By the career numbers, Luis Arroyo 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.