What this compares: the current coach voice, Cartesia Sonic 3.5, against your ElevenLabs Professional Voice Clone on three ElevenLabs models (Flash v2.5, Turbo v2.5, Multilingual v2), on six real coaching-session lines.
The ElevenLabs settings (stability 0.10, style 1.00, similarity 0.80, speed 1.15) are your locked HeyGen avatar-video settings, carried over as a starting point. They were tuned for narrating video scripts, not for back-and-forth conversation, so they may need retuning if a clone model is the pick.
The A through D order below is randomised once and held the same on every row, so you judge by ear first. Click "Reveal" to see which letter is which voice.