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I think the brain prefers glycogen to anything but in it's absence ketones are produced/used. IANAD but I think that they a more steady form of fuel for the brain. Unlike glycogen/carbs you don't get that rise and fall of energy. That steady flow was one of the best things I found about being low carb/in ketosis.
Lots of mentions of brain fog as a by product of eating a processed food/carb heavy diet by those who favour a LCHF diet. I've always thought it was a bit psuedo science myself (even though I like LCHF) and is just used as a way of promoting that type of diet.