What will sell more lifetime, Smash Bros Wii U, or Mario Kart 8?

[Ljink96]

curl-6 said:

Ljink96 said:
 they should just make a Smash Kart.

With Link, Villager, and Isabelle now in MK8, it's already happened. :p

But what if everyone had their own items, stages, and karts! I know it is already happening but not to the scale that I desire. I want Samus, Kirby, etc and their music and stages. It'll never happen though.