Whats yer question?
A fiberglass pool requires less maintenance, less repairs structurally in the future, is quick to install, and is good for smaller pools. Gunite pools are better for a pool deeper than 8 feet, custom shapes, and is a bit harder on the feet than a fiberglass pool.
Gunite will generally last longer than fibreglass (if you take care of the plaster, and "cure" the gunite properly when it is installed). You can also make a Gunite pool any shape and size that you like, whereas you're limited to the few molds that a fibreglass manufacturer has. Personally, I like the feel of a plaster (gunite) pool on my feet *much* better than paint or fibreglass. The biggest advantage of concrete over fiberglass is the structure. 8in. of concrete and steel versus 3/4 to1in. of fiberglass. I'll take concrete and steel every time. 30 yrs. in the biz. tell me so.
"Another View" There are benefits of each, design and feature wise there are some things you can do with gunite that you can't do with steel. Although some steel manufacturers are getting more sophisticated with regards to in pool stairs and other features. Mostly in my professional opinion it depends on where you are. In the northern climates where we see harsh winters and ground freezing, gunite can and will crack, causing sometimes expensive repairs. A steel wall vinyl lined pool avoides this as it's able to flex with the freezing. You should consult a few contractors in your area, ask their opinions and weigh all the benefits and disadvantages. Also trust your gut on which persons opinion may be better. "One View" Assuming this to be an in-ground pool as opposed to an upper floor or rooftop pool, gunite is, beyond a doubt, far superior. Steel is used rarely as the material of choice for an in-ground pool. However, of the millions of in-ground swimming pools in the USA, I have little doubt that many steel pools exist. Particularly, pools built during the pre-gunite era, i.e. before 1970, when the only alternatives where concrete (much more costly), or vinyl liners (slightly more costly but very limited in surface area). For the above reasons, a number of commercial in-ground steel pools were constructed, but very few residential pools. At this point in time, a pool constructed totally of steel would be the worst possible choice. END
For which application?
Steel takes longer to heat but stays hot longer. Aluminum heats up quickly but also cools down quickly.
Resists rust better.
SS is somewhat better in harsher weather.
The biggest problem with fiberglass is that it tends to start looking dull and faded after a few years. and the pving around them often starts to move because of the way they are installed.
A stainless steel one will ast a lifetime. Stainless steel also looks better than the standard one.