Unknown Arthur vs. John Costello — Career Comparison

On the career pitching numbers, Unknown Arthur posted a stronger line than John Costello. Unknown Arthur posted stronger numbers in ERA (0 vs 2.97) and WHIP (1.000 vs 1.395). By the career numbers, Unknown Arthur 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.