Choose an audio export according to what happens after extraction.
Use the Extract Audio alongside this illustrative example.
A practical example
For an interview you want to listen to or send for transcription, a compressed listening copy is usually easier to move. For audio you will edit repeatedly, an uncompressed working copy avoids adding another compressed intermediate. Compare a section containing speech and background noise before committing the entire recording to your editing workflow.
Check the result
Check that the downloaded file includes the beginning and ending of the interview. If the source has multiple audio tracks, verify that the intended language or microphone track was selected.
Try a comparison
Play the exported audio without its picture. Check whether speech remains understandable and whether you hear missing sections or the wrong track. Audio intended for transcription should be judged for intelligibility, not solely for the size of the downloaded file.
What this does not establish
Saving as WAV does not restore detail already lost in the source. Extracting a track also does not grant permission to republish music or speech.