100% the key advantage is non-reliance on monopoly privilege. But I'd argue Bitcoin *is* commodity money.
Discussion
Just for the contrarian take, I like Voskuils definition of Bitcoin as a market fiat money, man made and without use value, but without monopoly on production.
It is a super interesting take. For me it falls flat because people found non-monetary use cases for Bitcoin. Even if those use cases are uneconomical and silly, they do exist. Just like if gold became so insanely expensive that nobody used it industrially anymore, would Gold become Fiat? In my mind the monetary role of Gold and Bitcoin are equally man made, as are their utility in non-monetary forms. All fun to think about regardless