With salt water I’m going to go with thaws faster but keeps your cooler colder. With regular ice your melting point is 0 C so heat exchange occurs between air in the cooler and the ice between 0C and Say 5C air temp. With a -17 melting point you now have a say -17C source and the 5C air temp so the rate of heat transfer between the ice and the air will be higher. This means the equilibrium point between heat loss to the environment and heat absorption from the ice will be lower.
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