Marsala is available in many levels of sweetness, with dolce providing the best substitute for cream sherry. Madeira, produced on the Portuguese island of the same name, is another viable substitute. In a pinch, sweet vermouth can also be used successfully in many recipes.
First they are all concrete, just different application methods. Gunite (dry nozzle)is a dry mix where water is added at the nozzle. Shotcrete (wet nozzle) is premixed wet. They both use high air pressure to force the mixture to stick to the wall. Just as if you take a ball of mud and throw it at something, if wants to stick.
Gunite is concrete that is sprayed on dry while Shotcrete is sprayed on wet. Both materials are expensive, but both have a long life expectancy. Fiberglass pools can only be installed in areas where the ground has no movement or shifting. It has a shorter life span, but is one of the cheapest pool materials to install. Stainless steel pools are typically installed where concrete is not available or they are used in high-rise buildings. It is the most expensive of all pool structures, but it will last a long time. Vinyl is the least expensive pool to construct; however, it also has the shortest life span.