Aluminum and steel siding are both popular choices for exterior cladding, but they have several differences. Aluminum is lightweight, corrosion-resistant, and requires minimal maintenance, making it ideal for coastal areas. It also comes in a variety of colors and finishes. Steel siding, on the other hand, is more durable and can withstand harsh weather conditions. It is heavier and stronger than aluminum, but it may require more maintenance, such as painting or coating to prevent rust. Steel is also more energy-efficient due to its insulating properties. Both materials offer different benefits and are suitable for different applications based on the climate, design preferences, and budget.