Adam Peterson vs. Ed Pierce — Career Comparison

Looking at the career totals, Adam Peterson and Ed Pierce are fairly close on the surface numbers. Adam Peterson posted stronger numbers in WHIP (1.516 vs 2.438) and home runs allowed (1.39 per nine innings vs 1.69). Ed Pierce had the advantage in ERA (3.38 vs 5.46). By the career numbers, Adam Peterson 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.