December 2017 is the 50th month that the PlayStation 4 has been available for. During the latest month the gap grew in favor of the Wii when compared with the PS4. The gap increased by 2.89 million units in the last month. However, over the last 12 months it has decreased by 2.87 million units. The Wii currently leads by 8.27 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 73.64 million units, while the Wii sold 81.91 million units during the same timeframe.