Fine-Tuning vs Prompting vs RAG: Which Marketing Use Case Needs Which
Prompting alone wins when
You need general-purpose output with brand voice. Simple, fast, cheap. 80% of marketing use cases fit here.
RAG wins when
You need the AI to reference specific documents (past campaigns, product specs, brand guidelines). Retrieves, then writes.
Fine-tuning wins when
You have 10,000+ examples and need consistent output at scale. Rare for marketing — mostly overkill.