Good Housekeeping distinguishes between the finish created by a garment steamer and the pressure available from an iron. A steamer can be convenient for a quick refresh of soft, casual clothing and awkwardly shaped garments. It may struggle when the goal is a firm crease or the removal of stubborn wrinkles.

An iron offers a broad soleplate, adjustable heat and pressure against a flat surface, making it useful for shirts, linens and batch pressing. It also requires a suitable surface and careful temperature changes between fabrics. Match the tool to the garment and the result you want, rather than expecting either appliance to handle every task equally well.
GarmentCare Guide 