Jonathan Aro vs. James McDonald — Career Comparison

James McDonald built a career as a starting pitcher and Jonathan Aro as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. James McDonald posted stronger surface numbers — ERA 4.2 and WHIP 1.442 compared to 6.55 and 1.909 for Jonathan Aro. By the career numbers, James McDonald had the better of this cross-role comparison — though era context would sharpen the verdict.