Posted 10 May 2016 - 09:47 AM
Generally the first, not the second, if you are shooting standard coverage -- wide master, mediums/overs, singles...
Of course there is no rule that you have to shoot conventionally, it depends on the dramatics of the scene and the dialogue. You can imagine, for example, two people sitting across from each other but it's a police interview scene and the arrested person is the main character but the person asking the questions is a minor character, and you design a dolly move that starts over the shoulder onto the police officer but starts to arc around and lands on face of the main character and then creeps in until the end, so that the second half of the police officer's questions are all off-camera and the second half of the scene plays entirely on the face of the main character.
But if you set-up conventional overs and singles, you aren't going to stop and start the camera just to record only parts of the dialogue unless you have a very good reason -- it's better for the performance to let the actor run through it straight at least a couple of times, plus you don't want to totally lock yourself in in terms of the cutting, you never know if you may need to trim the scene in post and need one of those two angles in order to chop out a section of the dialogue.
Now after one or two takes, you may only shoot pick-ups of sections of dialogue if that's all you need and it's not going to throw off the performer.
And you may decide that the closer coverage only would be used in the more intense part of the scene and make a decision to not cover the dialogue in close-ups for the first half of the scene if it was not dramatic enough to warrant close-ups.
But for cross-cutting dialogue, traditionally you get both sides and then cut between them in post.