Dear Prakash
Coarse sand is better than fine sand. In cement masonary and conc. with coarse sand give more strength than fine sand, Coarse sand have less superfacial area than fine sand hence it gives more strength.In coarse material there is less shirankage which add to strength.
Some time in cruser sand there is possiblity of more silt than wash it with water.
Dear Prakash,
May be “stone crush” is better then sand, because it made of stone particle. But I m not sure.