Every few years there is a transformational prospect at the top draft that a team would not deal unless the return is a transformational pro in his prime (e.g., Lebron, KD, CP3, etc.). Looking back 35 years or so, these prospects included guys like Lebron, Tim Duncan, Greg Oden, Anthony Davis (barely), Shaq, Danny Manning (maybe), David Robinson, Patrick Ewing, Akeem Olajuwan, Ralph Sampson, and Magic.
Unless you see that guy at the top of the draft, and I do not in this one, then the question is simple. What am I getting back? If you like it, then you trade.