Hmmm. Probably better to short Dupont as a pure play. Pretty much an identical chart, I just think DD would move down faster in a down market environment. (Beta 1.44)
Plus they have the whole DOW merger thing in the works, albeit I haven't read up on the current goings on of that in awhile, but that could always throw a wrench in the works I would think... So imo, if you are thinking the time is right to short this... go with the Dupont short.