Greinke is almost assuredly going to be the more expensive of the two, while the production edge has been slightly on Marcum's side. Still, just in my opinion, this one is a no-brainer to invest in Greinke. Do that and you have to feel pretty good about having two ace-caliber pitchers at the top of your rotation for years to come. Plus, now might not be a bad time to lock up Greinke long-term -- he's coming off two years that were probably a little disappointing by his standards. Marcum to me is a much more risky investment and a perfect candidate to leave unsigned and offer arbitration to at the end of the season. He accepts it, great, you keep him around on a one-year deal and keep your rotation stacked without having to commit long-term to him. He declines, you happily take the picks and move on.