January 2018 is the 51st month that the PlayStation 4 has been available for. During the latest month the gap grew in favor of the PS4 when compared with the Wii. The gap decreased by 616,981 units in the last month and by 3.83 million units. The Wii currently leads by 7.65 million units.
Both consoles launched in November. The Wii launched in November 2006, while the PlayStation 4 launched in November 2013. The PlayStation 4 has sold 75.28 million units, while the Wii sold 2.94 million units during the same timeframe.