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My understanding (though limited) is that the brain generally uses glucose as a primary energy source (it has mainly GLUT1 transporters which are not insulin controlled as such), and that in the presence of ketone bodies there is a sparing effect on the glucose consumption in the brain, which to my mind implies that it is the glucose which is "preferred" rather than the ketone bodies, as the brain recognises a starvation state and therefore conserves the glucose.
(There are studies involving functional MRI scanning in rats which back this up)
Happy to be shown otherwise though.