1
Define the approved output
Choose recordings with the speakers, noise, accents and terminology your team actually handles. Specify whether the deliverable needs speaker labels, timestamps or a particular transcript structure; otherwise two outputs may look comparable while requiring very different amounts of editing.
2
Record every cost
For each transcription workflow, note the applicable service charges, any infrastructure you operate, engineering effort and minutes of human correction. Keep processing and review costs separate so a lower quoted rate does not hide a slower path to an approved transcript.
3
Repeat with difficult audio
Test long pauses, interruptions, proper names and mixed audio quality rather than relying on one clean sample. Ask reviewers to mark consequential errors, then compare how much time each candidate takes from submitted recording to usable text.