November 2019 is the 33rd month that the Nintendo Switch has been available for. During the latest month the Switch increased its lead over the Wii by 620,616 units and by 2.99 million units in the last 12 months. The Switch is currently ahead of the Wii by 2.18 million units.
The Wii launched in December 2006 in Japan, while the Nintendo Switch launched in March 2017. The Switch has sold 10.67 million units, while the Wii sold 8.49 million units during the same timeframe.
The 33rd month for the Nintendo Switch is November 2019 and for the Wii it is August 2009.
The Wii sold 12.77 million units lifetime in Japan. The Switch needs to sell another 2.10 million units to outsell the Wii.
source: gamezpot.com