David Hernandez vs. Parson Perryman — Career Comparison

On the career pitching numbers, Parson Perryman posted a stronger line than David Hernandez. Parson Perryman posted stronger numbers in ERA (3.93 vs 4.12) and home runs allowed (0.36 per nine innings vs 1.22). By the career numbers, Parson Perryman 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.