8th gen since it's by time.Though spec wise, closer to current gen.
The Wii U is soo powerful that it clocks its HD GPGPU @ 800 MHz.
The PS4 & ONE also clock their GPU's @ 800 MHz.
The Wii U can do way more open world then Lego City Undercover (Wii U).
Specs wise it's closer to XBox ONE, then PS3.