as far as pool finishes go, there are many factors to choose.
less costly compared to pebbletec or quartz, however, after about 5 years, you will start noticing a breakdown process of the resin. Also, Fiberglass is prone to a number of stains the other finishes will not have.
also, less costly compared to pebbletec or quarts, hoever, will show signs of wear after 5-10 years (chips, deterioration)
costly, however, lasts between 15-20 years before any noticeable wear on the surface. Also, there are many colors and styles to choose from!
The most costly, however it will also last between 15-20 years before any noticeable wear or missing stones. As with quartz, this also comes in many different colors.