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I would definitely opt to stay on the Argentinian side - we stayed at the Sheraton. There is so much more to do on that side and you can take a day tour to the Brazilian side if you choose. Be sure to take the boat ride under the falls. It is spectacular and you will appreciate the cool water because it is soooo hot and humid there.Having just returned from a trip that included a visit to Iguassu Falls, it was my impression that there are a lot more hotels on the Brasil side than there are on the Argentina side. Other things to do on the Brasil side include seeing one of the evening shows and a visit to the Itaipu Power plant (the largest in the world). The views of the falls on the Brasil side are quite different from those on the Argentina side, and if you are already in the area, you should certainly see both!