Noah has the size, but he's only slightly above average on offense and defense. He's very smart and doesn't do anything poorly, but I don't think his ceiling is nearly as high as Brewer's.
One thing NBA scouts love is that Brewer is an excellent defender who can also drive past his man. Brewer has the defense ready and has the offensive upside that Noah doesn't.
I think Brewer goes before Noah, but it all depends on how if a team wants to add size so bad they reach early. I don't see it happening.