When should you choose a professional voice-over instead of an AI voice?

An AI voice is useful for getting a feel for the timing of a project. As a proxy or placeholder in the NLE, it can work fine for getting the pictures and the rhythm right.

Do you want the message to really land? Do you want the interpretation of the text to be spot on, and to be able to direct? Do you want nuances in intonation that truly reach your audience? Are you after maximum conversion?

Then you need a human: a professional voice-over.