An idiot intern is better.
Well, 100% because the intern WILL eventually learn. That's the entire difference. It won't be about adjusting the prompt, or add yet another layer of "reasoning", or wait for the next "version" with a different code name an .1% larger dataset. No, you'll point to the intern they did a mistake, try not calling them an idiot, explain WHY it's wrong, optionally explain how to do it right, THEN the next time they'll avoid it or fix it after.
That's the entire point of having an intern : initially they suck BUT as you train them, they don't! Meanwhile an LLM, despite technical jargon hijacked by the marketing department, they don't "learn" (from machine learning) or train (from "training dataset") or have "neurons" (from "artificial neural networks") rather it's just statistics on the next most probable world, sounding right with 0 "reasoning".