You guys think that Smash Bros sales will boost Wii U above Xbox One and PS4 on a weekly basis but there is almost a zero chance of that happening.
A better version of Smash Bros will come to 3DS way before the Wii U version comes out. The 3DS will have better modes.
Probably 99% of Wii U owners own a 3DS and will want to get the better version first rather than buying the Wii U version later on (look to see what watchdogs sales for Wii U will be after having other versions out).
The 3DS version will be more favored because more people own a 3DS; people can play with more of their friends.
Nintendo gamers say graphics do not matter so buying a 3DS with Smash Bros is a hell of a lot more appealing than buying a $300 dollar system and a $50 dollar game for a couple extra pixels.
To be honest, I see the 3DS version selling 4 million and the Wii U version selling 2.5 million. This game will not be a huge system seller. All my opinion of course, what do you think?