Cox is the more advanced of the two, mostly because he has logged more professional innings before going down with his elbow injury. Melancon probably has the best stuff, however, and may have the better make-up to pitching in the eighth inning.
Whatever the case may be, both Cox and Melancon have the stuff and mentality to contribute to the Yankees big league pen this summer.
From the SWB Yanks blog:
The Yankees on Tuesday promoted J.B. Cox to Scranton/Wilkes-Barre...The Yankees brass just took another meaningful step toward inserting Chamberlain into the starting five.
Thanks to a text message good friend John Nalbone, is that Mark Melancon is taking Cox's place in Trenton. Melancon has been in Tampa where he's allowed one run in his past 13.1 innings. He's also walked two and struck out 15 in that span.