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

[samuship]

Galaki said:

It's common knowledge that Super Mario Bros. is vastly more popular than Super Smash Bros.

So, why did Sony decided to make their own version of Smash but not Mario?

It seems easier to make a platformer, too, since you don't need to juggle with characters balancing.

p.s. Sony even got their own version of Mario Kart.

Oh, but PSASBR is a totally different game from Super Smash, you can't compare them. PSASBR is totally original, and even if it was a copy, what's the problem? Nintendo didn't invented the genre anyways.  

 

*Sarcasm*