A draft pick.
People say Deng has more value than Noah, that is where I disagree.
A lot of SFs can do what Deng does. Score 17 a game and play great defense. With one of the best teachers in the game in Thibodeau, I feel most anyone could have achieved in Deng's spot.
I'm not saying start Kyle Korver, I'm saying if you trade Deng for a fringe all-star 2 guard, without giving up picks, Deng can be replaced.
Noah is one of the best offensive rebounders in the game, and is the only center who can run the fast break. That is more valuable then what Deng does, because Noah is the only one who can.
Deng does a great job, but he overachieved this season. He has injury history, and to me you trade at his highest value, which is right now.
A reality will be in about 2-3 years when Deng's contract is up, the Bulls will likely not be able to afford him. I'd rather trade him now for something of value.