For me it has to be Tom Seaver. 162 IP. 2.83 ERA. .88 WHIP. 12 QS. 132 SO v 9BB.
By most metrics he should be the strongest pitcher in my rotation. Record: 13-16.
Seaver is a beast, I struggled with him at first but he is my ace.
Carry Wood is cheap but will give you ten really good outings approx. Then his pitches have no bite to them.
0.88 WHIP is pretty insane...