PSV won the league by 17 points, there was a clear difference of quality between both teams this season (and I'm saying this as an Ajax fan). Not even debatable. Their team was massively better and had a lot more talents in there than Ajax did. Of course now that it looks like they're losing two of their best players (Memphis already gone and Wijnaldum on the way out) they're a bit weaker, but last season they were by far the best team in the Eredivisie. Ajax weren't close. Even without Memphis PSV have the better team by quite a bit as it stands (this is without them re-spending the Memphis money).