What happened in Rhode Island was more horrific as far as I'm concerned and the videos out there are enough to give one post traumatic stress. The reason is that in Brazil, the deaths were overwhelmingly caused by smoke, reports say. In Rhode Island, people died in the flames themselves. There's footage of people jammed in the entrance who never escape and later an inferno rages out of that entrance, the people inside were described in reports at the time as being stacked like wood and the heat then causing them to burst in flames and in those videos you can hear the people as they die.
That said more died in Brazil, twice as many. In both cases I blame the venue not the band.