If you need a publisher, not an agency. Hootsuite is mature, stable, and designed for teams who already produce content and need scheduling, listening, and analytics. We do not compete on that.
If your team writes its own posts. If your team has the writers and the editorial discipline already, the value of brand-bible validation drops because the writers carry it in their heads. Hootsuite is the right tooling layer in that setup.
If you manage 20+ accounts. Buzz is one team per brand. Hootsuite is built to manage many brands at once. If you are an agency-of-agencies or an enterprise with many sub-brands, Hootsuite scales with you in a way a managed retainer does not.