Steel: Robust and versatile, steel is often used in construction and industrial applications. You can choose from various grades of steel depending on the required strength.
 Advantages: Robustness, versatility (comes in various grades, each tailored to specific needs. Cost: Often more affordable than some high-end alternatives.
 Disadvantages:Sensitivity to corrosion: Standard steel can rust, so it requires regular maintenance. Weight: Steel is heavier than some other metals, which can be a disadvantage in certain applications.

Stainless Steel : Known for its corrosion resistance, stainless steel is ideal for demanding environments, such as food facilities or wet environments.
 Advantages: Rust-resistant, durable (as long as it's not subjected to extreme temperatures or chemical aggression such as salt), aesthetic (available in various finishes: mirror, super mirror, brushed, etc.), and sanitary (certain grades of stainless steel like 304 are suitable for food use such as cooking, food preparation, etc.)
 Disadvantages: Cost (it is more expensive than regular steel), weight (heavier than other lightweight metals like aluminum).

Galvanized Steel: The zinc coating provides additional protection against corrosion, making it a smart choice for outdoor projects.
 Advantages: Rust-resistant and cost-effective; it is generally less expensive than stainless steel.
 Disadvantages: Aesthetic (the appearance of zinc may not be as attractive as stainless steel or aluminum), Strength (less robust than stainless steel).

Aluminum: Known for its corrosion resistance, stainless steel is ideal for demanding environments such as food facilities or humid surroundings.
 Advantages: Lightweight (much lighter than steels), corrosion resistance, aesthetic appeal, easy to work with.
 Disadvantages: Cost (it can be more expensive than steel, depending on the quality of aluminum used), strength (may not be suitable for high-strength applications).

2 - What thickness?

Another essential consideration is the thickness of the sheet metal. This measurement will determine the strength of your parts and their ability to withstand the demands of your project. Commonly available thicknesses vary, but it's crucial to choose the one that best suits your application.

Steel: The maximum thickness for structural steel is approximately 1 inch, providing substantial robustness.
Stainless Steel: For stainless steel, you can choose thicknesses up to 1 1/2 inches, suitable for the most demanding environments.
Galvanized Steel: Galvanized is also available in thicknesses of up to about 1 inch, offering both sturdiness and durability.
Aluminum: Aluminum is available in thicknesses of up to about 1 inch, offering both lightweight and durability.