Well out of Young, Carter, Mikal, and Miles, Young is the most skilled overall. The most athletic is probably Miles. The best player at both ends of the court is Mikal, and Carter is obviously the best down low defender and scorer. It's sort of apples and oranges with three wing players and a low post player than can move out and stretch the floor. So it's pick your poison.
If I had to choose who of that group had the best chance of being a star, I would have to say Young. He probably accomplished more as an individual player this season than any of the others. He took over a team that was projected to be at the bottom of it's conference. A team with very little talent, and personally willed that team into the tournament. He created history by leading all of college in scoring and assists. And he did that despite being the single target of the other teams defense.
If there's a case to be made against him, it's that he wasn't the best defender in the world. But then, his own coach admitted that he gave Young instructions to stay out of foul trouble because he was the team's offense. The other question is whether his body will stand up to the rigors of the NBA. All I know is that I saw him attack the basket fearlessly, get hammered, and jump right back up. He's tougher than he looks, and remember, those were the same exact questions that were asked about Curry.
I guess, that as much as I like Mikal Bridges, and I would take him over Miles and Carter, I'm making a case for taking Young over all of them. Personally, I don't think Young will be there when we choose, assuming were choosing at seven. But if he is, and you want to pick the best player available, then I think you have to take Young, regardless of how many other guards we have. I'll promise you this, Young would be the first player since J. Will that will be a regular on ESPN's play of the night video's.