Found it interesting that Ashley Young said Ferguson is very similar to Martin O'neil in their managerial style, in that they both never ever does any tactical work (says Fergie only prepares the team tactically for a handful of matches every season) but what they really do daily is man management. Fergie can make all the players run the brick wall for him and training sessions are just happy to be in. But that won them titles after titles.
In contrast, when LVG came in, his sessions are highly technical, structured and super tactical. Other than Rooney most players didn't like it. His football is based on the ideals of not to lose and build from defence, while Ferguson will just ask the players to go for it.
When it came to Mourinho, he says the players hated the defensive style.