The best type of retaining wall depends on your needs and the site conditions. For small to medium projects, gravity walls are a great choice. They are heavy and hold back soil effectively and can be made from stone or concrete blocks. For taller walls or areas with more soil pressure, cantilever walls are strong and flexible, often made from reinforced concrete.
If space is tight or the soil is weak, sheet pile walls made from interlocking steel sheets work well. They are good for soft soil and are often used for shorelines. For a natural look, stone block walls are durable but can be harder to install. The right choice will depend on your budget and what you want the wall to look like.