Round-the-world travel · South America

Hi, We’d like to visit South America (among other places) with a vehicle, and I have a question about Chile and Argentina. A lot of "spots" are right on the border between these two countries, and I was wondering how to visit them since we’re not in a rush. Should we cross the borders without stopping so we don’t have to backtrack later, or should we explore the Chilean side first, for example, and then the Argentine side afterward? Thanks for your thoughts and advice! :)

My buddy Christian and I (Patrick) set off for 28 days in Argentina in March. We’ve already shared several trips together (Bolivia Peru, Namibia, Laos, Costa Rica). Since we figure that at our age (65) we won’t be coming back here—there are just too many other places in the world to discover—we did the "grand tour" of Argentina.