Some gutter materials are stronger than others. Each material also has its own pitfalls as well as its own benefits. For example, steel is the strongest gutter material, but it will inevitably rust no matter how well you take care of it. Aluminum and copper, on the other hand, are non-rusting materials. These types of gutters can last for decades if they are properly installed and taken care of. Most homeowners will opt for aluminum if they're looking for a metal gutter, because although copper gutters are strong and beautiful, they can also be quite pricey.