The best CMS is the one your team will actually use. For most clients that’s WordPress — it’s the most familiar, the most flexible, and (when built properly, not bloated with page-builders) it’s fast. For agencies with structured-content needs we still rate Concrete5. For very high-traffic or front-end-heavy projects, headless setups (WordPress or Sanity as the back end, a custom Next.js front end) increasingly make sense.
We’ll recommend honestly. The right CMS depends on how often you publish, how big your editorial team is, how much page-level flexibility you actually need, and how much you’re willing to constrain your content team in exchange for design consistency.