Jack Armstrong vs. Sam Cooper — Career Comparison

Looking at the career totals, Jack Armstrong and Sam Cooper are fairly close on the surface numbers. Jack Armstrong posted stronger numbers in ERA (4.58 vs 5.4) and WHIP (1.458 vs 1.534). Sam Cooper had the advantage in home runs allowed (0.35 per nine innings vs 1.17). By the career numbers, Jack Armstrong 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.