I would rank them Everth, Asdrubal, Franklin, Rendon, Ackley.
Ackley is horrible enough that nobody will want him, so youre pretty much stuck with him.
Everth is the best and might still be undervalued so keep him too.
Out of the other 3, I would try to trade Asdrubal just because he will likely bring you the best return, and Franklins ceiling is pretty close to what Asdrubal has done over the past year. Also Franklin has a realatively safe floor with his very solid batting approach.