Main reason is If you draft Noel you trade Biz and I don't know what we can get from Biz right now. But I know for sure Biz and Noel can't and won't work in the same front court. So IMO if you draft Noel him or Biz should be trade bait. And I have a bad feeling that Biz will be the 1 out.
Here is something a lot of you won't agree with.
I think Biz has more upside then Noel.
While Noel is the better at knowing what lanes to run on fast breaks and has better hands then Biz when catching passes. Noel has a better reaction time and more sure what to do when catching passes (which is because he has more American Ball playing experience and playing experience in general).
I think Noel is the better athlete but not by much.
I think Biz has a better body for inside play. Has a better touch on a jumper and I think he can develop a 12-15 foot jumper. Which I don't think Noel will have because he has no form or touch on his jumper.
I think Biz can develop a better back to the basket game because he has more power then Noel and can back people down.
Neither one of them can handle the ball so no real face the basket game from either.
On Defense :
Both are good Shot Blockers and Solid rebounders.
Noel is a better help side defender and blocker. Noel is a better outlet passer. Noel at PF could be a better Team defender because again he has more B-Ball playing experience. But Noel being so skinny isn't a great Man-up post player. Meaning he can get backdown by stronger players. So one on one with stronger post player might be a problem for Noel.
Biz is a better Man-up defender and a better shot blocker 1 on 1. He can hold his ground in the post and will get better at that as he gets stronger. But he already showed this talent when playing against the Howards Gasol and Hibbert's of the league. He still needs to get better with team defense and Playing the pick and roll. But that should come with more experience but right now Noel is better at this.
Just My Opinion but I see more upside with Biz at PF/C then Noel.