William Parson vs. Jim Pena — Career Comparison

Looking at the career totals, William Parson and Jim Pena are fairly close on the surface numbers. Jim Pena posted stronger numbers in ERA (3.48 vs 4.92) and WHIP (1.682 vs 1.856). William Parson had the advantage in home runs allowed (0.6 per nine innings vs 0.82). By the career numbers, Jim Pena 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.