Is that overall, or just the neo-cortex? Not that it matters that much, because I don't believe that brain size and intelligence have an exact correlation.
AFAIK, over all smaller.
Agreed that brain size and intelligence do not have an exact correlation, but on the average larger brains contribute to smarter critters, all other factors being equal.
In the case of modern man vs cro-magnon, modern man has essentially the same brain design, a smaller brain, and a bigger body to run with it.
OTOH, birds are disproportionately smart for brain size. I suspect a more efficient brain design.