Most of the flights to IGR leave from the domestic airport in BA, Aeroparque Internacional Jorge Newbery, which is close to the cruise pier. That is convenient for anyone arriving by cruise ship. You should look at baggage rules, however, since it was quite restricted when we were there. There was no luggage storage at the airport when we were there.
For the person arriving at EZE and then going to the falls, aside from possible delayed arrival or long lines at immigration, etc., the airport is a long ways from town and there was a major backup from an accident when we were there. We ended up staying in a hotel the night after our arrival and left for IGR the next morning, storing most of our luggage at the hotel. That also allowed us to recover a bit from our overnight flight.