Despite the Xbox One’s impressive sales back in April, the PlayStation 4 has retaken its position at the top of the market. Sony reported yesterday that the PlayStation 4 was the best-selling console last month, as well as the best-selling console overall for this generation, with more than 20 million PlayStation 4 units having been sold since launch. That number is only going to increase, especially considering all the big announcements that Sony will undoubtedly have at E3 next week.