Statement:
Nigeria has higher GDP than Sierra Leone

In the Richest countries rating Nigeria holds position #144 2020 out of 191 and Sierra Leone is #186 out of 191 2020.
Position of Nigeria is better than position of Sierra Leone.

Referencies:

  1. Richest countries 2020 by World Bank
    The countries in the rating sorted by 'GDP per capita (current US$)' in descending order.
    Nigeria 'GDP per capita (current US$)' value is 2,097.09
    Sierra Leone 'GDP per capita (current US$)' value is 509.38