Good post. I find the best solution depends on context.

I've never been able to use the dictator model effectively; it breeds rebellion and resentment outweighing whatever benefits it brings to cohesion.

With my peers and superiors, I use the nudge; with the people below me, I use the debate. I find that the well-structured debate is generally the most effective way to resolve problems, but nobody listens to you when you call for debate from below; the nudge is second-best.