August 2017 is the 46th month of the Xbox One being on sale. In the latest month the gap grew in favor of the Xbox 360 by 170,076 units and by 2.99 million in the last 12 months. The Xbox 360 currently leads by 721,052.
Both consoles launched in November. The Xbox 360 launched in November 2005, while the Xbox One launched in November 2013. The Xbox One has sold 30.89 million units, while its predecessor the Xbox 360 sold 31.62 million units.
[Source: vgchartz.com ]