They are both ways to tell you how you should feel about what is happening onscreen instead of letting the movie/show itself do so
They are both ways to tell you how you should feel about what is happening onscreen instead of letting the movie/show itself do so
But that’s the difference, the actor’s face is meant to tell you how their character feels. You’re free to be amused, inspired or upset by the fact they’re crying because they taken a banana cream pie to face. The laugh track or music (generally) is jot diagetic, it’s specifically there to colour your interpretation of actors and images.