I dunno I just think Winslow/Johnson are safer picks from the physical standpoint, they'll match up well against NBA players at least physically. Defensively they are also more solid.
Those are the questions I would have about Hezonja, but I know that he has a higher upside offensively vs those 2.
I think Winslow is a safe pick. Johnson actually has a few question marks based on how he's going to fit offensively as an SF or PF, though he'll do fine defensively. Hezonja is a prototypical wing. I have no issue with him at all.
The slightly risky guys look to be Mudiay (if he doesn't learn to shoot) or Porzingis (if he can't rebound and compete physically at NBA size and speed).