Yeah I'm gonna go with the Wii as well.
Both systems had some amazing first party gems, but while the Wii U had horrendous droughts in between them, Wii generally managed to plug the gaps will cool additions like Monster Hunter Tri, Goldeneye 007, Silent Hill Shattered Memories, de Blob 1 & 2, No More Heroes 1 & 2, Red Steel 2, Rayman Origins, Sonic All Star Racing & Colours, etc.
Also, where the Wii U Gamepad was cumbersome and ultimately didn't add much, the Wiimote + Nunchuk were a revelation when properly utilized. Playing Wii Sports Resort with 1:1 motion controls in 2009 felt downright futuristic, like something off Star Trek, while pointer aiming blew analogue sticks out of the water.