September 2017 is the 7th 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 255,579 units when compared to the PlayStation 4 during the same timeframe. The Switch is currently behind the PlayStation 4 by 1.33 million units.
The PlayStation 4 launched in November 2013, while the Nintendo Switch launched worldwide in March 2017. The Switch has sold 7.02 million units, while the PlayStation 4 sold 8.35 million units during the same timeframe.
[Source: vgchartz.com ]