Willie Jefferson vs. Bill Williams — Career Comparison

On the career pitching numbers, Willie Jefferson posted a stronger line than Bill Williams. Willie Jefferson posted stronger numbers in ERA (3.94 vs 5.06) and home runs allowed (0.41 per nine innings vs 1.69). By the career numbers, Willie Jefferson 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.