I think Brown's skill level is actually very high, and in many respects higher than Kevin Knox. He can handle, pass, rebound, attack off the dribble and score at 3 levels. He has really good feel, instincts and anticipation. He should be able to defend wings. He needs to work on his body and his shooting, and there's some risk, but he's a fairly complete prospect.
With Okogie, his skill level isn't quite as advanced yet and he plays a little out of control. For all his length and hops, he barely gets above the rim on his dunks and isn't quite the lock-down defender he should be. If his skill level really improves, he could be amazing. If it doesn't, he's mostly an energy player.