The NL West has produced two of the last 3 World Series champions. Sure the Padres are in there and the up and down Rockies, but its not a pushover division either.
Kershaw has a full K/9 higher than Felix since 09. A slight advantage in the HR/9. Their BB/9 are now about even. With a slight edge to Kershaw. Two better WAR seasons than Felix's best. Only reason Felix has a higher WAR the past 6 years is because you're using Kershaw's half season rookie year. Yes, I know he's in the NL and doesn't face the DH. That might even things up, but right now at this very moment. Give me the lefty.