Definitely Smash Bros. Nintendo's played the E3 hype game perfectly with it.

Monster Hunter: pissing me off since 2010.
Which Wii U game can beat the opening week sales of Mario Kart 8? | |||
| Super Smash Brother for Wii U | 142 | 62.83% | |
| Zelda U | 45 | 19.91% | |
| Super Mario Galaxy 3 | 7 | 3.10% | |
| Star Fox U | 2 | 0.88% | |
| Metroid U | 2 | 0.88% | |
| None, Mario Kart 8 will n... | 25 | 11.06% | |
| Other (Specify in comments) | 3 | 1.33% | |
| Total: | 226 | ||
Definitely Smash Bros. Nintendo's played the E3 hype game perfectly with it.

Monster Hunter: pissing me off since 2010.
| Mr Khan said: Definitely Smash Bros. Nintendo's played the E3 hype game perfectly with it. |
But SSB is also releasing on the 3DS before Wii U version.
spurgeonryan said:
Could you tell me what sold better on the GC?
Also, the Wii was a different beast. Historically, there has not been many Smash games. |
Three smash games. Three mario kart games released around the same time.
Mario kart 64: 9.87 million
Super smash 64: 5.55 Million
Mario Kart GC: 6.95
Super Smash GC: 7.07
Mario Kart wii: 34.52 Milion
Super Smash Wii: 12.17 million
Yes I know the numbers. 2 out of 3 times, mario Kart has sold far better. Nearly doubling the first time, and nearly tripling the sales the third. Melee sold .12 more than mario kart double dash. Which is a difference of 120,000 copies. That's a difference of 1.7%, which most would consider a nearly negligible amount. Of the three games combined. Mario kart has sold 51.34 million, and Super smash bros has sold 24.78 Million. So yes, I'd say that Mario kart has a higher chanc of making a greater difference than Super smash bros. Numbers are on my side. I'm not saying that's it's impossible that SSB will do better, I'm just saying that I think Mario Kart has a far higher chance of making the bigger difference given both of their histories.
Edit. I also forgot to mention the fact the SSB4 is being released on the 3ds as well, which is bound to take away a ton of steam from the wiiU version. Why would you go out and buy a wiiU when you can play the same game in the palm of your hands?
Ucell said:
But SSB is also releasing on the 3DS before Wii U version. |
And that's basically the only hope that version has of not getting vastly overshadowed. At least in the West.
The hype's all there for the Wii U version.

Monster Hunter: pissing me off since 2010.
Smash and/or Mario Galaxy 3 for the Wii U definitely could "smash" MK8 sales in the first week.
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Depending on the advertisement campaign, Smash could and so could Zelda



"I think it will be the HDS"-Me in regards to Nintendo's next handheld.
Smash Bros 4 and Zelda can top MK8's opening week! I am not too sure about other games though.. 
---Member of the official Squeezol Fanclub---
Smash will have the advantage of the holidays and a bigger user base (which is significant for the Wii U considering how small it is now). SSBB did 800k+ in Japan and 1.3m in the US. I really have no doubt in my mind it can do half those numbers with EU being the decider. Think it can manage 500k in Japan, possibly 600k in America.
Sm4sh will easily beat opening week sales. Mario Kart has better legs than Smash, Smash has better openings.
"You should be banned. Youre clearly flaming the president and even his brother who you know nothing about. Dont be such a partisan hack"
Smash, didn't it come out on Wii in spring just a bit before MK and still have a better opening? Having a higher install base and holiday to boost sales will make it the biggest opening WiiU will see in its life. 1.6m+ is entirely doable.
I do however wish it'd go to Starfox.