What's the difference between a dual showerhead and a regular handheld?

A dual (or 2-in-1) showerhead keeps a wall-mounted fixed head AND adds a detachable handheld on a hose, usually with a diverter that lets you run either one separately or both simultaneously. A standard handheld replaces the fixed head entirely with a wand on a hose. Reviewers across r/bathrooms and r/HomeImprovement consistently recommend the dual setup for households that want rinse-down convenience without giving up an overhead spray.