May 2018 is the 15th month that the Nintendo Switch has been available for. During the latest month the gap grew in favor of the PS4 during the same time frame by 22,396 units when compared to the Switch during the same timeframe and by 58,295 units in the last 12 months. The PlayStation 4 is currently ahead the Switch by 1.53 million units.
The PlayStation 4 launched in November 2013, while the Nintendo Switch launched worldwide in March 2017. The Switch has sold 17.33 million units, while the PlayStation 4 sold 18.87 million units during the same timeframe.