Dr.Vita on 20 July 2015
Buy a PS4 with PSTV.
On PSTV you can play all the PS1 and PSP classics and most of the PS Vita games which are not avalaible on PS4.
On PS4 you can play all the Playstation exclusives like Uncharted: Nathan Drake Collection, The Last of Us: Remastered, God of War 3: Remastered, Bloodborne, Infamous: Second Son... and the big third-party games like The Witcher 3: Wild Hunt, Mortal Kombat X, Batman: Arkham Knight...
