After Porcello's last start, I get the feeling that Britton wins.
Too many of these pitchers are bunched together. Tanaka, Kluber, Verlander, Sale, Porcello and Quintana all have very similar stats. 3.10 to 3.20 ERA. 200 to 220 IP. WHIP from 1.00 to 1.10. All have 16+ wins. 5 to 6 WAR. Unless there is a big pro-win crowd out there who votes Porcello in, none of these guys truly distinguish them from eachother.