David Aardsma vs. Tom Thomas — Career Comparison

On the career pitching numbers, Tom Thomas posted a stronger line than David Aardsma. Tom Thomas posted stronger numbers in ERA (3.31 vs 4.27) and WHIP (1.355 vs 1.487). By the career numbers, Tom Thomas 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.