Mike Armstrong vs. Brian O'Connor — Career Comparison

On the career pitching numbers, Mike Armstrong posted a stronger line than Brian O'Connor. Mike Armstrong posted stronger numbers in ERA (4.1 vs 5.11) and WHIP (1.405 vs 1.865). By the career numbers, Mike 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.