April 2018 is the 14th month that the Nintendo Switch has been available for. During the latest month the Wii has closed the gap with the Switch and taken the lead. The Wii outsold the Switch by 3.65 million units in the last month and by 4.64 million units in the last 12 months. The Wii is currently ahead of the Switch by 2,836,091 units.
The Wii launched in November 2006, while the Nintendo Switch launched in March 2017. The Switch has sold 16.67 million units, while the Wii sold 19.51 million units during the same timeframe.