ElevenLabs is the strongest fit for narrating a 30-second commercial script, offering a wide library of realistic AI voices with fine-grained control over pacing, tone, and emphasis. You can paste your script, audition multiple voice styles, and export broadcast-ready audio in minutes. Its Starter plan at $5/mo gives ample character credits for a short commercial. Descript is worth considering if you also need to edit the audio or sync it to video in the same workflow, and Suno fits better if the project calls for a music-backed jingle rather than straight voice narration.