William Brennan vs. Max Castillo — Career Comparison

Looking at the career totals, William Brennan and Max Castillo are fairly close on the surface numbers. William Brennan posted stronger numbers in ERA (5.18 vs 5.43) and home runs allowed (0.74 per nine innings vs 1.51). Max Castillo had the advantage in WHIP (1.391 vs 1.849). By the career numbers, William Brennan had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.