Orlando has long coveted Dragan Bender who they could take at Pick #3.
Aaron Gordon + Nikola Vucevic + Pick #11
for
Amir Johnson + Avery Bradley + Pick #3
I'm not sure Orlando would bite on that deal given the rise of Aaron Gordon (or if we would) but Frank Vogel is a defensive minded coach and has an affinity toward defensive oriented players.
A sure-fire way to lose in a trade is to give up the two best assets. #3 > #11 and Bradley is the best player in the deal.
I believe Vucevic is the best player in that trade, or at the very least the most valuable. 25 year old 7' centers that can shoot foul shots and are a quality defender, rebounding, and scorer. Those guys are much harder to find. In fact, Vucevic averaged more points, rebounds, AND assists than Bradley. He has better metrics such as VORP, OBPM, DBMP, BMP, etc.
Vucevic produces better than Bradley and plays at a position much harder to fill. He is thus the best player in that trade.