This was difficult to choose. I like both. :D

I am DE fan. So I don't really ship any of these, but SE is definitely better couple for me, they actually had a relationship, and they love each other. Bamon barely had any scenes together and almost all were Damon trying to kill Bonnie or Bonnie trying to kill Damon. I haven't read the books. Maybe they are great couple there, but in the show definitely not.

the both is great

As much as I dislike SE, at least they have been a couple and they did have some nice moments. But BD don't even like each other and they are not and never will be a couple.

I'm not a Stelena fan but Bamon doesn't make sense. They actually hate or at least dislike each other. Bamon on the show is nothing like Bamon in books, on the show they basically don't exist together.
And Stelena sometimes can be cute.

I'm in the minority here, but as a Delena fan, I hate Stelena much more than Bamon. I actually don't hate Bamon at all, I don't really care about them, they're just an AU couple so I don't really mind, if people wants to ship them, let them.
Stelena on the other hand really annoys me, especially since they're an actual couple with scenes and I have to sit through those scenes.

I dislike both

Just Stelena !!