Dickey would be the one to go for me
WHY?
Dickey is much older and Niese is under contract for many years out with the 5 year deal plus option years
Dickey does have a very hard pitch to hit (if moving) so that limits the righty lefty difference BUT I do like to have at least one lefty.
With that said, There is not much in terms of lefty SP down in the system - MAYBE Gorski but he needs to show more to me -- early pitched very well and then fell at AA
Of the 2 Niese will bring back more but Dickey bring back ANY Value is a win. IF you remember we signed Dickey as a minor league free agent and he is going to bring back something of need to an organization will alot of them.