If you write a story and want to be immersive, my preference would be a UI that exists in the story/world itself.
Like the cellphone menu or a PC or a tablet.
I know it is used a lot.
If you have to make a choice in dialogue that's difficult to include in the world though.
You could always try the Mass Effect style of choice.
So, as i was prototyping the interface of my game ( 3D Visual Novel graphics with role-playing branching dialogues ) i couldn't decide for an intuitive and immersive way of letting the player know choices can be made through dialogue options but also with screen elements to avoid dialogue choices like *kiss her* and to instead just click the lips.
Examples of what im also trying to avoid can be found in games from lesson of passion in which a spark indicates the option, or games where you could completely miss the option like vdategames.
In terms of visual design and functionality, which adult games do you think have the best interface?