All of those guys are great coaches, hard to distinguish between them. Popovich has certainly had talent to work with as well, where as Sloan has never worked with the same level of talent, but definately gets the most out of his guys. To win in Basketball you have to have talent, you simply have to. It is the one sport (at least between football, baseball, and basketball) that one guy can take over a game. Phil has definately worked his system, but his brilliance is controlling the egos (much like Torre during his Yankee years). The best basketball coaches IMO are actually guys like Coach K and the great college coaches, because at that level the Xs and Os are much more important. But, from an NBA aspect the 3 you named are easily the best IMO.