...in the United States, at retail
The PlayStation 4 was once again the top selling console in May of 2014, though we haven't had a specific sales numbers update from anyone in a while.
As for software, Ubisoft's day-one sales record holder Watch Dogs, released to every console and certain calculators, unsurprisingly took the top spot. Mario Kart 8, only available on the Wii U and only for two days of the May 2014 reporting period, still took number two. Sony exclusive MLB The Show made it to third with a stand up triple.
May 2014 NPD: PlayStation 4 And Watch Dogs Come Out On Top [Game Informer]