Shape, size and price get most of the attention when people research a pool. The interior finish is what you see and clean every day, and it has a large say in long-term cost.
Concrete pools need a separate applied finish such as plaster, quartz, pebble, tile or paint. Each option has its own lifespan and a resurfacing cycle. Fibreglass is different: the gelcoat is the interior surface, built into the shell, so there is no separate finish to apply or replace on a regular cycle.
The Fibreglass Pool Company gelcoat is designed for UV and chemical resistance, with Sparkle colour options that stay part of the shell. Port Pools By Design installs that range across the NSW Mid North Coast, so the finish decision is largely a colour choice rather than a resurfacing plan.
If you are comparing fibreglass with concrete, start with how you want the water to look, how much cleaning you want to do, and whether you want to budget for another interior later.