VGChartz' William D'Angelo: "PlayStation 4 Vs. Wii Global:
Gap change in latest month: 779,411 – Wii
Gap change over last 12 months: 5,390,253 - Wii
Total Lead: 7,454,837 – Wii
PlayStation 4 Total Sales: 25,446,528
Wii Total Sales: 32,901,365
August 2015 is the 22nd month of PlayStation 4 availability and during the month the gap grew in favor of the Wii when compared with the Wii’s 22nd month on sale by 779,411 units. In the first 22 months, the Wii currently leads by a total of 7.45 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 25.45 million units in its first 22 months, while the Wii sold 32.90 million units during the same timeframe."