There is not enough information given upon which to decide which ion is more easily reducible.
Species are reduced when they accept electrons. When a specie is reduced, it experiences a decrease in its oxidation number. Recall that redox reactions involve giving and taking of electrons.
The reduction potential of a chemical specie gives us an idea which specie is more easily reduced. The reduction potential tells us the ease with which a chemical specie accepts electrons and become reduced.
Had it been that the reduction potentials of both species were provided in the question, we can make a decision regarding which specie is more easily reduced.
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