Not sure the Celtics have much use for either of those players. Young is a better prospect given the Celtics Roster at this point in time. Young is the only SG under contract at the moment Babb and Johnson are both team options.
I disagree.
I suspect that Vonleh will be an All-Star (or if not, a borderline All-Star) 2-3 years from now. I wouldn't be too shocked if Embiid ends up ruined due to injury, and Vonleh ends up the best big man from this draft (over Randle, who I syspect will be a major bust).
I think Vonleh has a good chance of becoming a decent player but is nonetheless overrated. Here's an interesting take:
"I don?t think I have written anything about Vonleh yet in spite of him perpetually being on the top 10 of my big board. He has good stats, solid tools, enough skills, and is super young so this earns him a top 10 slot. But he?s overall a fairly bland prospect. He?s not a rim protector, he?s a weak finisher, he has bad hands, and he has a horrible assist to turnover ratio. His main appeal lies in his small sample 3 point shooting where he made 16/33 attempts. It?s nice to get a stretch 4 who can rebound and possibly play solid defense, but I struggle to see how he becomes a top 15 player and he has plenty of bust risk. In my eyes his upside is David West with 3 point range. That?s not a bad upside, and I like Vonleh considerably more than Julius Randle. But I think it would be a big mistake to take Vonleh over Marcus Smart or Aaron Gordon, and I also favor international bigs Jusuf Nurkic and Clint Capela."
http://deanondraft.com/2014/06/23/parsing-through-the-ncaa-prospects-part-1/