If you have to struggle, ordinary sand is better.

Ordinary sand is natural and elegant or polished all the year round, and its internal structure is relatively complete.

The sand on the cobblestone floor is basically crushed by high pressure and strong force. It is not excluded that the internal structure of some particles will be destroyed, but the overall strength of particles with intact surfaces will be weaker than that of ordinary sand to some extent.

You can use both if you don't struggle.

If you use high-strength and high-demand pile foundation or road and bridge, it is best to use natural sand.