Jack Armstrong vs. Casey Janssen — Career Comparison

Jack Armstrong built a career as a starting pitcher and Casey Janssen as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jack Armstrong led in strikeout rate (K%+ 103 vs 76), run prevention (ERA+ 89 vs 87), and home run suppression (HR9+ 85 vs 85). Casey Janssen held the edge in walk avoidance (BB%+ 171 vs 91). Keeping the role difference in mind, the edge still goes to Jack Armstrong.