Keep them both
Trade them both
Trade Dickey, I think he gets back more in return
Trade Niese, I think he gets back more in return
I would trade Dickey and keep Niese even though I think Niese can fetch a better return
I would trade Niese and keep Dickey even though I think we can get more talent by trading Dickey
It really depends on who we're trading them to. If it's to a team that's contending for the World Series every year, then Dickey would bring in a larger load, but if the trade partner is a team on the brink of contention with a young team, like the Royals or Pirates, then, in my opinion, we could get more for Niese.
A team that thinks they are an ace away from a championship might be more willing to deal for Dickey and deal some of their best prospects for him. Those teams usually are the ones that over pay. A team like the Tigers or Dodgers, not that they need an ace, but another one to go along with their best pitcher. Also a team like the O's, Angels and Texas who have money to spend and care more abut winning now.
Though a team like the Pirates might be more willing to deal for a Niese because his price tag is better suited for them.
Like I said it all depends on the team.
Bigger market usually equals more talent in return.
...and before we hear Gio Gonzalez name, he had 2 excellent years of 200 innings pitched for the A's.
Dickey has been an ace for 3 years now and if a team gets a window to extend him am sure they would be willing to give up some real good talent as well. Also Dickey is not going to cost a team 60 million for 4 years or 5/75. Realistically 3/36 is what he will get on top of the 5 million for 2013 or 4/45.
Not all of them do, do you remember Perez? did Zito improved with age?
Nobody is saying he does not have value, but his value is limited by how good he is, as of now he is a mid rotation guy at best, so why teams will be willing to give up a stellar package for for a mid rotation guy? He is not an ace or has pitched like an ace for teams to be willing to par with some of their best prospects just for Niese. Would the Mets be willing to trade Harvey and others for Niese if he was in another team?, so why would a team be willing to trade a prospect like Harvey let alone 2-3 guys for Niese?