Out of Gamecube and Wii U I actually found the latter to be better.
GC had a few gems but in my opinion it had Nintendo's weakest first party lineup, there just aren't that many interesting games on it to me. Wii U, for all it's problems, at least had a fair few excellent games like BOTW, MK8, Tropical Freeze, Bayonetta 2, Captain Toad, Splatoon, etc.








