Here you can see a few examples of a gunnite pool. Full on the left and under construction on the right.
Gunnite pools are considered higher end in the line up of pool types.
Its advantages include:
Unlimited control of the shape and size.
This is the second type of pool, arguably just as nice as a concrete pool but with a few limitations.
Limited to the size and shape offered by the manufacturer or your contractor.
Only a few color options.
The Third type of pool is liner pools. Much cheaper to build but there are slightly higher costs of upkeep when the liner needs to be replaced every 5 to 12 years.