I think most users are upgrading their Xbone to S version. Most users upgrading the PS4 will get a PS4P not the new slim version and since PS4P released only this month. Xbone got a head start. Another reason could be gears4 and FH3. Although these games are available on PC? But still that probably made little bit of difference as well. So it is doing well in the US for past 3months. Overall though PS4 is still ahead inspite these factors







