Will depend on loads and environment. Normally SS is better but economics have to justify the additional durability.

Stainless steel will Outlast galvanized 10 to 1 matter of fact it's almost indestructible the nickel in the steel makes it stainless.

Galvanized steel is coated with a thin layer of zinc that helps guard against corrosion. ... Stainless steel, on the other hand, is made by adding chromium to molten steel. Because of its strength and resistance to rust, stainless is the primary metal used in construction.

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