Do you think Former Middlesex (much of London pre 1965 today) is more similar to Essex or Surrey?

In London, Middlesex basically was everything north of the River Thames (separating it from Surrey and Kent) and west of the River Lea separating it from Essex. Out of the 2 options, which is Former Middlesex most similar to in terms of neighbourhood and urban layout and housing types. It might sound a bit of a strange question