I have a shotcrete pool. In all of my research, shotcrete seem to be the best with the only downside being slump. This is where the heavy concrete tends to not stay straight on the walls. The gunite seemed to need more expertise to be applied and could have more problems with having the higher strength of the lareger aggregrate concrete. Based on everything, I choose the shotcrete and I am very happy I did. The slump prblem never happened and the pool looks beautiful. I would worry if the the guy running the gunite gun is learning to do it on your pool or hes an expert. Seems that he could ruin your pool and it may take a few years to find out (or you can have a piece of the pool sent out and tested for hardness). The question is whether you trust the guy they send to your house to mix the gunite on site or the concrete plant that does this all the time. I chose the concrete plant (shotcrete pool).

My two cents

John