Closed captions also provide hints as to non-dialog audio; song lyrics, musical tones, important noises in the background etc. Personally I always use subtitle

Closed captions also provide hints as to non-dialog audio; song lyrics, musical tones, important noises in the background etc. Personally I always use subtitles, and closed captions if it's available; there are quite a lot of audio clues that I wouldn't otherwise know are even interesting, that get highlighted - mostly extra detail rather than plot important, but it does key you up to things happening or about to happen in the background.