David Aardsma vs. Jason Johnson — Career Comparison

Jason Johnson built a career as a starting pitcher and David Aardsma as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. David Aardsma led in strikeout rate (K%+ 120 vs 87), home run suppression (HR9+ 114 vs 94), and run prevention (ERA+ 109 vs 92). Jason Johnson held the edge in walk avoidance (BB%+ 89 vs 76). Role difference aside, David Aardsma holds a clear edge on every meaningful shared measure.