I think it's more relevant to consider whether the PS4 is easier to code for than XboxOne.
One uses DirectX - essentially it's own platform that scales to thousands of possible system configurations.
One uses a proprietary language.
In some ways it would be like comparing PC development to Linux.
Guess we'll see how it turns out. But based on over a decade of solid development support for their platform - I wouldn't be too worried about MS' position.








