As the local saying goes: if you want to see the Iguazú Falls, got to Brazil, if you want to be in them, go to Argentina. This is the Salto Bosetti, probably the second most photograph of the whole complex. This view is taken from the Brazilian side, although the waterfall itself is in Argentina.
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If you're staying in Argentina, crossing to Brazil is fairly easy, by car or by a travel agency who can help with the border. As a rule of thumb, Spring is the rainy season: this has a double effect: it'll be cloudy and darkish, on the other hand, the waterfalls will be at full strength.