Stainless steel and aluminum alloy have their own advantages, and the specific choice depends on the application scenarios and requirements. Stainless steel has corrosion resistance, high strength and heat resistance, and is suitable for kitchen utensils, building structures and chemical industries. Aluminum alloy is light in weight, high in strength and good in electrical conductivity, and is suitable for aerospace, electronic industry and building structures. The choice should be weighed according to the actual needs and application scenarios.