What are the differences between zinc and stainless steel screws, and which one is better for my project?

Zinc screws are cheaper and more prone to corrosion, while stainless steel screws are more expensive but resistant to rust. Stainless steel screws are better for outdoor or wet environments, while zinc screws are suitable for indoor projects. Choose stainless steel for durability and longevity, and zinc for cost-effectiveness in dry conditions.