How to choose tilapia shrimp fish tank material？

Now more and more people begin to use simple splicing fish tanks instead of traditional fish ponds or concrete fish ponds.
The most representative of which is PP fish tank and galvanized steel fish tank, the installation of both are very convenient...
But which material do you think is better?

[@samuelvargas9260]

Wich Is the smaller size of the pp tank?

[@krisdia283]

smallest size 2m diameter