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My teacher said that OF2 is the third most powerful oxidising agent after F2 and atomic O, but I think O2F2 should be even more oxidising, since it less stable than OF2. I just read on quora that O2F2 is so unstable that it readily oxidises anything that comes in contact even when it is frozen. Also, in case of hydrides of p-block we say that reducing power increases down the group as the tendency to donate H increases due to decreasing thermal stability, so on similar lines, I think O2F2 should be a more powerful oxidant.

Or is it because in OF2, the oxidation state of O atom is +2 (compared to +1 in O2F2), which it wants to get rid of and thus gets reduced, oxidising the other species readily. But if this is true then why is it more stable as we know that stability is inversely proportional to reactivity? Or are the concepts of stability and oxidising power completely unrelated?

I was not able to find the electrode potentials of these species, so how could they be even compared reliably?

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