Marty Bystrom vs. John Williams — Career Comparison

Looking at the career totals, Marty Bystrom and John Williams are fairly close on the surface numbers. Marty Bystrom had the edge in ERA (4.26 vs 4.37). By the career numbers, Marty Bystrom 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.