The hardness and toughness of 304 stainless steel are much better than copper, but the electrical conductivity of copper is much better than stainless steel.
In terms of corrosion resistance, stainless steel has better performance than copper. But in terms of heat transfer, copper is much stronger than stainless steel.
Products made of 304 stainless steel are more environmentally friendly than copper. Because the surface of products made of stainless steel is generally directly polished or sanded manually without electroplating, it does not contain any toxic elements and is relatively more environmentally friendly and hygienic. The surface of copper products must be electroplated, and electroplated products will contain a small amount of toxic element "lead" that is harmful to the human body.