Kohei Arihara vs. Paul Penson — Career Comparison

On the career pitching numbers, Paul Penson posted a stronger line than Kohei Arihara. Paul Penson posted stronger numbers in ERA (4.5 vs 7.57) and home runs allowed (0.56 per nine innings vs 2.23). By the career numbers, Paul Penson 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.