Bigger 1st week sales: Mario Kart WiiU vs Watch Dogs Xbox1

[superchunk]

On any individual current-gen platform, I'd take MK8 easily.

If you consider WD on either of the two last-gen platforms then its a tougher call. While WiiU has significantly smaller user base than PS360, it will sell to a much higher % of its base and therefore will still sell over million first week.