Buffer vs Planable
Buffer is built for people who manage their own social media. Planable is built for agencies and freelancers who need client approval workflows. If you work alone, Buffer. If you have clients reviewing content, Planable.
Verdict
Solo creator? Buffer. Agency or freelancer with clients? Planable. It's that simple. Planable's approval workflows — with preview mockups, annotations, and multi-level sign-offs — are best-in-class for client work. But if nobody's reviewing your posts before they go out, you don't need it.