if a human had a large brain and another human had a small brain which would work better or doesn’t it matter?

Question: if a human had a large brain and another human had a small brain which would work better or doesn't it matter?
- Keywords:
  body,
  human,
  organ
Asked by to Joe, Juan, Kate, Rory, Rosie on 13 Mar 2014. This question was also asked by .
- Rory Miles answered on 13 Mar 2014:
  
  I’m not a neuroscientist, but the size of a brain does not affect how it works. For example, Einstein was a very intelligent person, but his brain was a similar size to most peoples. As far as I know, scientists aren’t sure what effects peoples intelligence, but size most probably does not affect this.
- Kate Salmon answered on 15 Mar 2014:
  
  Rory is right. Victorian scientists used to think that women were less intelligent because they had smaller brains but this is clearly not the case!

Question: if a human had a large brain and another human had a small brain which would work better or doesn't it matter?