Should I use AI-generated testimonial ads or human spokesperson ads?

Use both, routed by job: AI-generated testimonial ads for volume and testing — roughly $75 and under an hour per creative versus $300–$600 per creator and two-week turnarounds on marketplaces — and a human spokesperson where trust or brand premium is the main purchase barrier. Since you can't predict winners before shipping, produce both and scale on ROAS.

Start with what actually converts, because it isn't AI-versus-human — it's authentic-versus-polished. "Polished fake testimonials are dead" in either format: a testimonial ad performs when it reads as value-first, native content, so brief your AI testimonial to look like it was shot on a phone, not a studio. Having a person on screen matters more than who produced them: in one documented side-by-side in Meta Ads Manager, a person-led UGC ad returned 6.2x ROAS against 0.8x for a product-only ad. And AI testimonial videos with AI spokespeople tend to land as "independent voices" rather than brand-voiced ads — which is exactly the register a testimonial needs.

The case for AI testimonials: economics and volume. A full AI testimonial-style UGC ad — hook, A-roll, B-roll, voiceover — runs about $75 and roughly one hour to build, versus $300–$600 per human creator with at least a two-week turnaround; a two-person team can ship 4–5 per day. That matters because Meta and TikTok demand more creatives than most teams can physically shoot, and Lapis's analysis of 10,000+ campaigns plus practitioner reports of 3.0–3.5% more clicks from AI-generated ads back the efficiency case. invideo is an agentic video creation tool that produces these end to end — the invideo agent handles script, casting, voiceover, and clip generation inside one project, so testing five testimonial variants costs less than one creator booking.

Where a human spokesperson still wins. Ipsos research finds consumers often can't distinguish AI ads from human ones, but human-made ads still generate stronger emotional engagement — so for premium, high-consideration, or trust-sensitive products, put a real spokesperson in the hero ad. The KB position is honest here: at current quality levels, AI video generation doesn't replace skilled human producers. Execution risk is also real for AI testimonials — the same face, the same product, and the same look have to hold across every shot, and missing any one makes the ad read as fake — so lock character and voice before generating dialogue shots.

Handle disclosure before you scale. An AI-generated testimonial that implies a real customer's experience is a deceptive-advertising risk under FTC rules on fake reviews and testimonials — disclose AI-generated personas or write them as spokesperson-style value content rather than fabricated customer claims. A trust hit here erases any CPA advantage.

The decision rule: ship both, scale the winner. You can't predict which format wins without shipping it, so produce AI testimonial variants for volume testing and one human spokesperson ad as the credibility anchor, then let platform ROAS pick what scales — at ~$75 per AI creative, the cost of testing all formats in parallel is lower than guessing wrong once.

Watch some of these to see what works for you:

UGC isn't dead, bad UGC is. Polish fake testimonials is dead. Value first and native wins.

— invideo's creative team