Tom Butters vs. John Mackinson — Career Comparison

On the career pitching numbers, Tom Butters posted a stronger line than John Mackinson. Tom Butters posted stronger numbers in ERA (3.1 vs 7.36) and WHIP (1.453 vs 1.773). By the career numbers, Tom Butters 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.