The question contrasts a powerful centralized kingdom (Great Zimbabwe, Mali) with a locally governed region (Congo Forest). Arguments favoring the latter include:
Historically, the Congo Basin's dense forests and river networks facilitated decentralized, lineage-based societies (e.g., Kongo, Luba, Kuba) that proved resilient over centuries. Centralized states, while capable of monumental projects, often suffered from succession crises, overextraction, and rigidity.
The "better" model depends on values: efficiency/scale vs. liberty/adaptability.