Separate workspaces matter more than any other single feature
A shared calendar covering multiple clients invites exactly the kind of mix-up that damages trust fastest: the wrong post going out under the wrong brand. A scheduler built around separate workspaces per client removes that risk structurally, rather than relying on careful labeling within one shared space.
Reporting has to be presentable to a client, not just accurate
An agency's reporting needs to work as a client-facing deliverable, not only an internal dashboard: clean, exportable, and tied to what the client asked for. A tool with strong internal analytics but no reporting export solves half the problem for an agency.
Pricing that scales with clients, not just channels
Since an agency's channel and client count both tend to grow over time, checking how pricing scales with both, not only the number of social channels, matters more here than for a single-brand account.