who would you rather have in a standard dynasty league w/o salaries?  (I'm trading from position player depth to acquire one of these guys, but I'm having a tough time deciding which one I prefer.)  They have similar sample sizes over the last three years.  Romero definitely has a better K rate, but Cahill has an advantage in age and the division in which he pitches, and has the potential to increase his Ks.  Not sure about injury risk on both, but I know Romero had elbow and shoulder issues in the minors.  Any thoughts?