Porn n stuff.

Ehh What?

What's the point of this?, please explain.

Read/watch some hentai, it's better for you.

Hentai is porn. So how do you know he's not talking about hentai?

It's not that difficult to figure out.

From what I could understand from the OP.
A girl is dancing to music. When suddenly she's being fucked by a guy who also cums insider her.

And then he's asking us if we prefer "porn" with or without story.

I know that most all 3D porn are story less. With the exception of "I'm here to fix you're tv, ma'am. You might wanna fix this hot pussy, while you're at it, BIG BOY. *Ungodly amount of fake moans later* You're pussy should just fine now. Thank you mister." .

But hentai can be story less as well. Take 1+1+1=∞ for example. That one is pretty much story less.

OP's identified 2 different situations, one with a story and one without a story.
One where a girl is dancing to some music and then sexy randomly ensues (no story)
Then one that involves a plumber going to a girl's house etc (story)

I still say he's talking about real porn, but we can apply this to hentai manga and anime anyway.

To answer OP's question in terms of hentai: I prefer it with story.

Pretty sure there's been a thread on this anyway.

Music intro with dancing pornstar then guy pops up and rams it in her.

Some "whadaphuckisdis" story like "Secretary in her office not doing her work but instead appears to be masturbating then boss comes in and finds out and rams it in her."

When it comes to real porn I prefer it to not have story. Let's face it, when they try to have story it's usually terrible or just makes me laugh instead.

In hentai story is a wonderful bonus.