How do I determine which has the greatest solubility in water?

For example I have calculated the solubility of several compounds using their Ksp values. How do i tell which one is the most soluble in water? Is it the compound with the highest number or lowest number. For example CdCO3 = 2.28e-6, ZnCO3 = 6.32e-6 and AgI= 9.11e-9