Mma Ufc Bjj

I want to learn some grappling.

Both Judo and Bjj seem powerful. I've seen UFC and BJJ seemed the absolute art.

But BJJ may be the absolute art in cage-fights .What about real self defence and not UFC- MMA matches ?

Is Judo more effective for self defence than BJJ, while BJJ is more effective for MMA matches than judo ?

And when some people talk about the superiority of BJJ , is it that they mean "the superiority in MMA matches " and not "the superiority in the street " ?

Because in the street first you punch / kick, but then when the guy comes close to you, you need something to throw him down , and when you do so , you want to throw him in a way that he will be hurt , plus the fact that judo has some ground techniques to immobilize the victim.

Because with the opponent you don't want to touch each other so much and instead of falling in the ground, it's better to wreslte so as not to (i talk about the average opponent , and not a bjj'er or judoki opponent )