August 2017 is the 6th month that the Nintendo Switch has been available for. During the latest month the gap grew in favor of the Wii by 236,047 million units. The Wii is currently ahead of the Switch by 687,529 units.
The Wii launched in November 2006, while the Nintendo Switch launched in March 2017. The Switch has sold 6.08 million units, while the Wii sold 6.77 million units during the same timeframe.