December 2017 is the 10th month that the Nintendo Switch has been available for. During the latest month the gap grew in favor of the Switch during the same time frame by 3.96 million units when compared to the PlayStation 4 during the same timeframe. The Switch is currently ahead the PlayStation 4 by 2.93 million units.
The PlayStation 4 launched in November 2013, while the Nintendo Switch launched worldwide in March 2017. The Switch has sold 13.36 million units, while the PlayStation 4 sold 10.43 million units during the same timeframe.