It's easy to make blanket statements like that, but harder to back it up.
Who are the players for Williams?
Dallas: will have the money, but will surround him with an aging cast of players. Quick wins, but not much going long term.
NJ: has the money, but he knows what that team can do. They are a long way from winning if that's what he wants
Phoenix: another team a long way from being a contender. He would be replacing their best player.
Indiana: if he doesn't mind small market, then this would be a nice fit with Granger, Hibbert and a growing cast.
Portland: has the money and another all-star with a young cast who would fit nicely around him.
If he is only concerned about money and endorsements, then he stays with NJ and loses.
If he wants to end up with multiple title shots, then it is between Indiana and Portland, with Indiana maybe having the edge. I don't see how Portland is so far out of contention. It's not like they are competing with every team in the league for him. Only those with cash who have a chance to win.