Jack Armstrong vs. Roy Thomas — Career Comparison

Jack Armstrong built a career as a starting pitcher and Roy Thomas as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Roy Thomas led in home run suppression (HR9+ 121 vs 85), run prevention (ERA+ 100 vs 89), and skill-based run prevention (DICE+ 99 vs 89). Jack Armstrong held the edge in walk avoidance (BB%+ 91 vs 90). Role difference aside, Roy Thomas holds a clear edge on every meaningful shared measure.