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I'm not an expert but the obvious solution is to give the Oxford/AstraZeneca vaccine to the 18-55 population and the mRNA vaccines to those 65+. The mRNA vaccines also have stringent and extreme freezing requirements that the Oxford one doesn't.

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Moderna's vaccine's refrigeration requirements are not extreme. It just needs -20 C (i.e what a kitchen freezer can do) for shipping, and then will be good for a month at 2-8 C, i.e. kitchen fridge temps.

From the leaked EU prices the Moderna vaccine is 10x the price of the Oxford one. I guess that will be a key factor.

Everything's been pre-ordered (at least in the west) so I doubt price will be a key factor.

First of all, your "10x the price" means a price point between 10$ and 50$. That's hardly a blocker.

Some people, when facing the choice of having a shot at a vaccine sometime in the future and have a reliable vaccine right now, would gladly pay 10x to speed it up.

Why not give the mRNA vaccines to everyone?

The mRNA vaccines can’t be produced quickly enough.

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