Burkina Faso is 2.4 times larger than Benin.
Area: 112,622 km2 World Factbook
Population: 10,160,556 (July 2014) World Factbook
Benin, officially the Republic of Benin, is a country in West Africa. It is bordered by Togo to the west, by Nigeria to the east and by Burkina Faso and Niger to the north. Wikipedia
Area: 274,200 km2 World Factbook
Population: 18,365,123 (July 2014) World Factbook
Burkina Faso, also known by its short-form name Burkina, is a landlocked country in West Africa around 274,200 square kilometres in size. It is surrounded by six countries: Mali to the north; Niger to the east; Benin to the southeast; Togo and Ghana to the south; and Ivory Coast to the southwest. Wikipedia