It really depends on your need. First of all determine the amount of pressure the webbing will be under in pounds and look above to see which webbing fit your range. Then decide whether your webbing will be used indoors or outdoors. Nylon is a very strong webbing that comes in many bright colors, but can fade in the sun after repeated exposure, and can stretch when wet about 2% the length of the webbing over repeated use. Polypropylene is a lighter duty webbing, but has U.V. Protection, water resistant, and overall is a great outdoor webbing. But, it typically in more standard colors and has a rough feel if repeatedly used against the skin. Polyester is a great outdoor or indoor webbing it is strong and abrasion resistant.