Crossed the border and took in the other side of the story - very divided opinion which side is better, afraid I've got to sit on the fence and say both were awesome - brazil has the better overview and argentina the sense of sheer power. Going to try and post a video which captures it better than the stills

ps puerto iguazu is a truely horrible little place! Full of crooks trying to take os gringos for a ride! Nearly got in to a little tête-à-tête on our very first day in Argentina! Doesn't bode well! Then again, a Brazilian, a Brit and a cross between the two, travelling in Argentina, was never going to be the most popular combo!