Venezuela is not only almost completely dependent on oil exports (extreme price fluctuations) but it's also not agriculturally self sufficient. It's not the only country with those problems, and they're not insurmountable problems, but it requires good economic planning to be able to handle downturns in those conditions, something Venezuela didn't have.
Argentina, on the other hand, has somewhat more varied exports (though soy and corn products are a large portion) and is agriculturally self sufficient. Unlike Venezuela, which had a "export oil, import everything else" mentality, Argentina has a large degree of economic protectionism and so they do have other sectors to help supply domestic demand to some degree.
There's obviously many other factors, but those are the largest ones in my opinion.
Argentina, on the other hand, has somewhat more varied exports (though soy and corn products are a large portion) and is agriculturally self sufficient. Unlike Venezuela, which had a "export oil, import everything else" mentality, Argentina has a large degree of economic protectionism and so they do have other sectors to help supply domestic demand to some degree.
There's obviously many other factors, but those are the largest ones in my opinion.