Mack Allison vs. William Sheppard — Career Comparison

Looking at the career totals, Mack Allison and William Sheppard are fairly close on the surface numbers. William Sheppard had the edge in ERA (2.9 vs 3.17). By the career numbers, William Sheppard 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.