Answer: Greater reduction potential
Greater reduction potential means a greater tendency to reduce itself and oxidize others.
An oxidizing agent is a chemical species that tend to oxidize other substances, i.e. cause an increase in the oxidation state of the substance by making it lose electrons. Common examples of oxidizing agents include halogens, oxygen, and hydrogen peroxide.
How do we determine the stronger oxidizing agent?
The stronger the oxidising agent, the greater the pull of electrons. As a result, the element with the highest electronegativity will be the most powerful oxidising agent.