What factors have been considered in the ship route design from Rio de Janeiro, Brazil to China, the Atlantic Ocean or the Pacific Ocean?

In Rio de Janeiro on the east coast of Brazil, it is usually necessary to cross the Atlantic Ocean, bypass the Cape of Good Hope, then cross the Indian Ocean, enter the South China Sea, cross the Taiwan Province Strait, and unload at the port ... Generally speaking, VLOC takes this road. If they go to the Pacific Ocean, they have to bypass Cape Horn, mainly because the Pacific Ocean has a long span and a long voyage, and oil is expensive now, you know ... and the Panama Canal can only pass 70,000-80,000-ton ships at present.