Which is cheaper, aluminum alloy die casting or zinc alloy die casting?

Zinc alloy die-casting and aluminum alloy die-casting, which is cheaper, depending on the product to evaluate, aluminum alloy die-casting mold cost is higher than zinc alloy die-casting mold cost, but zinc alloy is more than the same product, the material cost is more than aluminum alloy, so which is cheaper, or according to the product to evaluate!