Over the years the way steel pool walls have been made is top quality. The thick galvanized coating that goes on them makes these panels a lot less prone to rusting and other types of corrosion; as a matter of fact they should easily outlast most other parts of the vinyl liner swimming pool they are built as part of. Steel pools opened up pool ownership to the masses with their affordable cost. Due to the way steel walls are made it is a easy to attach add-ons such as steps, swim outs and tanning ledges.
Polymer walls eliminate even the slightest chance that things such as corrosion or rust will take place and weaken the pool wall structure. They are high impact resistant so there will not be any imperfections after the building is done and they will not dent under any circumstances with normal pool use. Polymer pool wall panels are much lighter in weight. Most panels can easily be moved by a single person which makes the pool wall structure much easier to assemble.