Ola,
Since I have done both, I would reccommend to take ruta 40 (great landscapes). Yes indeed the coastal road becomes quiet boring, though there are very good side-trips to undertake into the national parks.
This might be an idea: Uyuni-salt planes-southwest Bolivia-cross over to Chil,San Pedro de Atacama-cross over to Argentina at Huaytiquina-take the ruta 40-cross over again to Chili, Santiago.
Enjoy!
|