The least expensive, most DIY-friendly option because the sections just snap together. Color choices are limited, although it can be painted. Vinyl won't rust or rot but becomes brittle in extreme cold and intense sun. It can bend and bow under heavy rain, wind, and snow loads. Available in K-style (shown), half-round, and a faceted U shape. Look for a warranty of at least 20 years.
Cost: About $1 to $2 per foot