Why did Sony go with Super Smash Bros. too instead of Super Mario Bros. too?

[Fifaguy360]

Galaki said:

There was no reason to bring LBP into this thread and be thrashed about. But here goes,

You can't beat that awesome platforming.

That's impressive. Mad props to whoever made it. But it feels so clunky for a platformer. Mario games have much better control response.