Is a mesh system better than a range extender?

For whole-home coverage, reviewers across communities generally prefer mesh because it hands devices off seamlessly and avoids the speed penalty of repeating wirelessly. A single extender is best when you only need to fill one or two rooms or a garage. If you already own an eero or TP-Link Deco/OneMesh setup, an add-on node that joins the same mesh is usually the smoother path.