Carey to me looks presently better and to have more upside than Koprivica. Not a knock, just don't get why he's rated lower.
Size, frame, skill for a HS soph. are unreal for Koprivica. Those things on a 7 footer are much more scarce than a smooth 6-9 PF.
Personally, I'd take Carey Jr. because I love his mentality on a basketball court, where he treats the rim like it owes him money. Often times, kids who have that soft of a touch want to fade away from contact and you have to coach a motor into them. You do not have to do those things with Vern Carey Jr. and I think he's a top notch college player.
Love to have both, of course.