Hader bested Yates in K/9, H/9, and WHIP. They were pretty close in BB/9 (2.4 vs 1.9). ERA, ERA+, and FIP Yates has the clear advantage. Hader's HR/9 was unsustainable high and Yates was unsustainably low. Career wise, they are virtually the same allowing homeruns but Kirby has pitched more in HR suppressing parks. Point is neither was clearly better than the other, unless you're a Brewer fan with bad memories of the last few games of the year.