I can agree that some of the months XOne may win over PS4, but I think there is a little more to think about. Globally I only see PS4 stretching the lead, which in turn will get more developers to want to make games for PS4.
Also, globally PS4 software has been outselling the XOne software for all multiplatformers.
Also, with the added horsepower of the PS4 I have seen the better resolution and frame rates and some better features from PS4. Also, I have seen multiple developers stating how that PS4 has the better power.
I have already seen a few games that are only being made for PS4 or PC because of the XOne indie developer clause that says if the game is already on a different system, then they cant make it for XOne.
With all of these items combined I think that it will make more and better games come out for the PS4 as time goes on and more PS4's will get sold in the US and Globally.