I would say Phil Jackson because he's never had a legit point guard and his system, goes through his best players and everyone else filling in their roles and understanding their roles.
He wouldn't let Fields and Lin play 2 on 5
He would use Melo/STAT like Kobe/Gasol or even Melo/JR like Jordan/Pippen
He would bring out the best in all our players because he 1. holds guys accountable and 2. they will listen to him and do what he says
He's the best coach at half time adjustments, can control egos and can make most guys look good