This master thesis examines how AI-generated advertising content performs compared to human-created advertising across relevant consumer KPIs such as attention, ad likeability, credibility, brand trust, brand fit, consideration and purchase or usage intention. The focus lies on advertising effectiveness from a media perspective: how creative origin, channel context and campaign objective influence brand and performance outcomes. For the Sparkassen-Finanzgruppe, the study provides actionable insights into whether and how AI-generated advertising can be used effectively in a trust-sensitive banking environment.