William Parson vs. Joel Peralta — Career Comparison

Looking at the career totals, William Parson and Joel Peralta are fairly close on the surface numbers. Joel Peralta posted stronger numbers in ERA (4.03 vs 4.92) and WHIP (1.194 vs 1.856). William Parson had the advantage in home runs allowed (0.6 per nine innings vs 1.32). By the career numbers, Joel Peralta 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.