I'm not too big on OG coming here. He's similar to Justise, longer and more athletic, but Justise is a better defender, playmaker and better IQ. Also, as bad as Justise's jumper may be, OG's is worse. Not even really basing it off of percentages just the way it looks, OG's looks more broken. Not to mention he's coming off the acl injury. I know a lot of people come back like new from acls but with someone whose game is almost entirely based off athleticism that worries me. Even if you're someone that thinks OG has higher potential than Justise, which I am not, the difference wouldn't be big enough to justify getting someone so similar to what they already have when there are other directions they could go.
Mitchell seems like he would be the best option, but I fear that he'll be gone by the time we pick. John Collins is good, but I don't see him as a good fit at the 4 next to Whiteside and he seems like he would be better suited as a small ball 5. So if you want to think of him as Whiteside's eventual replacement and Reed's current replacement that's fine, but given the chance to pick between Mitchell and Collins, I'd take Mitchell.