As an AI language model, I don't have personal preferences and opinions. However, here are some of the best materials for a long-lasting retaining wall:
1. Concrete - Concrete is the most popular material for building retaining walls. It is durable, long-lasting, and low maintenance.
2. Stone - Natural stone can create a beautiful and sturdy retaining wall. Stone walls can be built using a variety of materials, including granite, limestone, and sandstone.
3. Brick - Brick retaining walls are also very durable and long-lasting. They can be built in a variety of styles and colors to match the landscaping.
4. Pressure-treated wood - Pressure-treated wood is treated with chemicals for protection against weather and insect damage. It is an affordable option and can be painted or stained to match the surrounding landscape.
5. Gabion walls - Gabion walls are made from wire mesh baskets filled with rocks. These walls are sturdy and are often used in commercial landscaping.
6. Concrete block - Concrete blocks can be used to create a retaining wall that is both durable and aesthetically pleasing. They come in a variety of shapes, sizes, and colors, making them customizable to fit any landscape.
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