You'll find many views about the two sides of the falls. I mean the falls. Not the other stuff each side has.
When I did my research, I had less than 24 hours for the falls and that was it. No other option. Factor 12 of that as darkness and my time was limited.
From what I could glean, the Argentinian side allows you to get close to the falls in many places. You get the best views at the devils throat.
This area photo shows what I am talking about.
http://www.travelblog.org/Photos/2104465
Track the walkway put from the top of the image.
It does not allow you to see the extensive panoramic views but does offer some reasonable panoramic views.
The Brazilian side allows you to get very close in the area towards the devils throat but you get to see a step type fall and you can partially see north from the platforms over the water but the view is ubstructed by the spray.
The little red hut in the image on the bottom is where you can see the falls up close on the brazil side and where you can see the step area, there are nice walkways.
See the first two images in this link
http://luxetravelreport.com/travel/6...azu-falls.html
Now I was not interested in jungle tours or things unrelated to the falls.
The boat ride was not permissible for insurance reasons and sadly, so was the helicopter ride.
So I settled that I would rather spend time at three different times of the day on the Brazil side and buck up and stay at the Belmont des Cataratas in the park.
Best choice for me.
I was able to spend about 2 hours walking around before watching the sunset over the Argentina side. The hotel was great and I had dinner on the terrace with a view of the falls in the moonlight.
Was up early to watch the sunrise and then had some breakfast and went back to see the falls in the best sunlight. This was around 11 looking towards the Argentina side. Then had to take my flight to Rio for 2 nights before my business meeting.
I personally, from my research, think both sides are great and just don't agree that one can say one side is better than the other. Perhaps one side has more other activities that I could careless about but the falls from the brazil side was jaw dropping.
Having stayed in the park at the hotel, 70% of the time I spent at the falls was almost BY MYSELF. Not one person around since the park closes but hotel guests can stay. In fact, I'll do a tr when I get my shiit together but it was at 10:30 on the day I left when I actually saw more than 10 people looking at the falls.
This was on March 28th of this year and I had perfect weather both days. Not a cloud in the sky.
Don't worry if you can only do one side with limited time. I was bloody impressed and even had a good ribeye dinner too...and the Brazilian beef is not too shabby.