Soundwave on 22 September 2015
Both systems at the exact same point in their life cycle:
Nintendo GameCube (shipments through September 2004): 15.9 million
Nintendo Wii U September 2015: 10.3-ish million-ish sell through, lets say shipment of 10.8-11 million units shipped.
They're way behind. More than a year behind. Also this gap is getting bigger not smaller every month, GameCube continues to outsell the Wii U month for month.
