Its merely different strategies to achieve the same thing.
They both try to gain exclusive games on their consoles, Sony by running its own studios which gives it more say in the development and long term can bring in large gains but can also cause larger losses by a struggling studio. Microsoft prefers to buy individual games from independent studios which gives it the chance to choose a game already on the way to completion and brings in an instant game and runs the risk of losses game by game.
Both are valid ways of attempting the same thing.








