I was wondering which phenotype is the winner for the biggest brains of all, and I find there is some potentially conflicting evidence.

According to this map you have probably seen already, the biggest brains would fall unmistakeably in Siberia, coinciding with Tungids.



http://humanphenotypes.net/basic/Tungid.html





But on the other hand and also according to humanphenotypes.com, the largest heads are found in Borrebies. You can see they are described as having an "extraordinary large head" and referenced in the head size section as the largests(>355), whereas tungids even if large are not as extraordinary(>350)

http://humanphenotypes.net/metrics/headsize.html
http://humanphenotypes.net/Borreby.html

This has made me think of several possibilites, mainly these 2:
1) Borrebies heads are indeed larger than tungids', but somehow the latter's brain is still the largest somehow, even if the head is not as big.
2) Borrebies brains are really the largest as well(in line with head-brain size correlation), but this doesn't register in the first world map about brain size cause they're averaged out by being grouped with all the other european phenotypes.



Anecdotically, the two largest human brains ever recored belong officially to Turgenev (clear european Upper Paleolithic/cromagnid tendencies) and unofficially some claims attribute the record is held by Kim-Jong-Il(who would fall close to the Siberian families). I mention this as only a fun fact but in any case it'd wouldn't help up clarify the question.

I find it an interesting topic cause we are deciding between two noticeably different population groups, and depending on which interpretation we favour the size difference is quite significant, actually flipping the ranking.

So which race do you suspect is the winner for this metric? Any opinion, argument, fact, etc. is welcomed.