Shotcrete or gunite can have its advantage over the other but depends on the construction application.
For shotcrete, it takes shorter time in application because it is pre-mixed and the only thing you need to do is to spray it towards the surface. Since it is also pre-mixed, the material is more consistent and thus, quality and performance.
Another advantage would be rebound can be lesser which equates to lesser waste and weak spots. The drawbacks would be because it is pre-mixed, the wet mixture should be applied quickly before it hardens giving no room for delay or pauses in between application.
Lastly because it needs to cure, shrinkage cracks are more evident.
For gunite, it can be harden quickly compared with shotcrete because the operator can control and adjust the water content after the mixture is being sprayed to the surface.
It gives you more room during the application since the mixture is dry and there’s no problems with it being hardened during the application.
Lastly, it creates smoother finish and lesser shrinkage finish. The drawbacks would be because the operator is the only one who controls the water content, it can have higher risk of error resulting to weaker spots. Another because the dry is being applied to the surface and then the water, it creates rebound which are the material that falls on the ground. These rebound cannot be used thus, waste.