Buddy Hield gets a writeup from Dean Demakis. It's not very positive:
My favorite Hield comparison is Anthony Morrow. He can easily populate his game outside of shooting to be a rich man’s Morrow (most readily by not being awful on defense). Also he can make a greater shooting impact by getting off a higher volume of 3’s, even if he 3P% will likely be lower. A more complete Morrow is a useful rotation player, and if his work ethic leads to surprising leaps in his game, Hield will become a starting caliber SG.
Buddy is worth a 1st round selection, but his equity to be an above average starter is slim, and he isn’t going to become an all-star. It is possible that I am underrating the value of his massive 3PA rate, his slashing ability, and his odds of becoming competent defensively, but I simply do not see the upside to justify a lottery selection.