July 2017 is the 5th month that the Nintendo Switch has been available for. During the latest month the gap grew in favor of the Switch by 521,480 units when compared to the Wii U during the same timeframe. The Switch is currently ahead of the Wii U by 2.63 million units.
The Wii U launched in November 2012, while the Nintendo Switch launched worldwide in March 2017. The Switch has sold 5.39 million units, while the Wii U sold 2.76 million units during the same timeframe.