WiiU is a absolut good option in combination with CFW. Nativ u can play WiiU, Wii, GC Games. Able to play a lot of Emulation like N64, SNES,NES and others.
U can nativ use different Controller on it like Dualshock. From now on, u can play Wii Games with it, too.
And like others say, a lot of games of the Switch u will find on WiiU, too.