John Johnstone vs. Si Simmons — Career Comparison

Looking at the career totals, John Johnstone and Si Simmons are fairly close on the surface numbers. John Johnstone had the edge in ERA (4.01 vs 5.4). By the career numbers, John Johnstone 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.