Brandon Brennan vs. John Mackinson — Career Comparison

On the career pitching numbers, Brandon Brennan posted a stronger line than John Mackinson. Brandon Brennan posted stronger numbers in ERA (4.21 vs 7.36) and WHIP (1.387 vs 1.773). By the career numbers, Brandon Brennan 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.