If we can't visit places like Cordoba on the way due to the floods I will think about a bus. That's why I'm asking. I would prefer to visit places on the way and not drive 1000 km without stopping.

We would have to rent a car in Mendoza anyway. I can't imagine how we could get around without a car?

Why would we need to be fluent in spanish for driving? We drove in Greece without a problem and we don't speak a word - we can't even read their alphabet