Jack Armstrong vs. Bob Macdonald — Career Comparison

Jack Armstrong built a career as a starting pitcher and Bob Macdonald as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Bob Macdonald led in run prevention (ERA+ 101 vs 89), walk avoidance (BB%+ 100 vs 91), and skill-based run prevention (DICE+ 94 vs 89). Jack Armstrong held the edge in strikeout rate (K%+ 103 vs 90). Role difference aside, Bob Macdonald holds a clear edge on every meaningful shared measure.