Steel Above Ground Pools have been around for decades. They are the original type of above ground pool component material. Things haven't changed a whole lot for steel pools except the metals being used have gotten better and with a lot better protective coatings. Steel component above ground pools are very strong above ground pools and were for decades considered some of the best above ground pools on the market.
Aluminum above ground pools are made with components which are100% aluminum. Aluminum above ground pools do not rust or corrode like steel can. The Aluminum interlocking pool wall is powder coated with a beautifying enamel that adds a high glossy luster to the finish and further protects the aluminum for a finish that will last for many, many, many seasons.