Personally I would take Darvish. I really like him and I don't think we have seen the best from him. Gio, I am worried that we saw the best from him last year and I am not buying into him as much as a lot of people are. If there was a bigger round difference between the two that might change things for me but with it only being one round I would lean towards Darvish.
But I can see your point about keeping Cole and if you feel that is the safer route to go then I would be fine with that. It is still a solid value for Hamels.
Do you have any reasoning behind why you think we haven't seen the best of Darvish but have seen the best of Gio? Gio's numbers have come down every year for the past 4 or 5. Darvish is still a wildcard and everyone is just making assumptions based on how dominant he was in Japan.
And Hamels is like a dependable Ferrari.