CrewAI or AutoGen: Choosing a Multi-Agent Coordination Model

Your team is asked to build two different features:

• Feature A: an automated content pipeline where a "researcher" agent gathers facts, a "writer" agent drafts an article from those facts, and an "editor" agent checks the draft against a style guide before publishing — a fixed, repeatable process run thousands of times a day unattended.
• Feature B: an internal tool where an engineer pastes in a design doc and two agents — a "proponent" and a "skeptic" — debate its trade-offs back and forth, with the engineer able to jump in and redirect the conversation, to help the engineer stress-test their own thinking before a review meeting.

For each feature, say whether a role-based (CrewAI-style) or conversational (AutoGen-style) multi-agent mental model fits better, and explain the failure mode you'd most worry about and how you'd guard against it in each case.