I would like to categorize the research destinations by countries. In the level of postdoc positions, let consider three categories, the first one includes US, UK, Canada and Australia, second one includes (West) European countries and the third category consists of China, Brazil, eastern European countries and India. We know that the first category is a popular destination for postdoc applicants. I would like to know whether a postdoc position in third category has any weight from perspective of academia? I know this is a general question and it depends on many factors, more specifically, list of publications.
There are strong research groups and weak research groups within all the categories of countries you mentioned. The weight of the postdoc period depends on who you are working with and what you accomplish.
Doing a postdoc in a particular country might make it easier to find a position there; going abroad at some point in one's academic career will make it easier to find a position in some countries.