David Aardsma vs. Scott Patterson — Career Comparison

Looking at the career totals, David Aardsma and Scott Patterson are fairly close on the surface numbers. Scott Patterson posted stronger numbers in ERA (1.93 vs 4.27) and home runs allowed (0 per nine innings vs 1.09). David Aardsma had the advantage in WHIP (1.487 vs 1.929). By the career numbers, Scott Patterson 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.