Both materials excel in durability, but in different ways. Teak’s natural oils provide built-in protection that can last 50+ years with proper care. The wood actually becomes harder and more stable as it ages. However, teak can develop surface cracks (checking) over time, which is purely cosmetic and doesn’t affect structural integrity. Aluminum won’t rot, rust, or attract insects, making it virtually maintenance-free. High-quality aluminum furniture with proper welding and powder coating can easily last 20-30 years. However, the powder coating can chip or fade over time, especially in harsh UV environments.