Mario Kart is ahead of Watch Dogs Xbox1 for preorders thus far.  I think there is a chance that Mario Kart WiiU will outsell Watch Dogs PS4 in the first week.  Although I don't think Mario Kart will outsell Watch Dogs across all platforms in the 1st week, I do think that Mario Kart WiiU will outsell Watch Dogs (all platforms combined sales PS3, PS4, Xbox1, Xbox360, and PC) for lifetime sales.

1	Watch Dogs (PS4) Ubisoft, Action	2	29,541	358,634
2	Destiny (PS4) Activision, Action	17	6,002	299,430
3	Destiny (XOne) Activision, Action	17	5,330	260,817
4	Mario Kart Wii U (WiiU) Nintendo, Racing	2	56,387	231,863
5	Watch Dogs (XOne) Ubisoft, Action	2	17,326	230,634

Easy. Mario Kart 8.

Because Japan.

Because higher install base.

Because will many postpone their WD X180 purchase for the pricecut.

I say Mario Kart 8 cause it did not have even close to the amount of bad press that Watch Dogs has but with that being said, Watch Dogs is on the ps4/x1 which are dying for some games so who knows

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.

Put US in op!

It'll be close, but even if MK8 loses i expect it to overthrow Watchdogs(X1) in 2 or 3 weeks after.

Its 5 days vs 2!!!

You put a exclusive against a multi-platform. I no way is that fair, but I'm still going with Mario Kart 8.

Exactly this.

He put it up against the Xbox One version alone, not every version.

MK8.

easy mario kart higher install base, and it seems like the hype for it increase by the day while watch dogs hype is decreasing by the day