Interlagos is better than Suzuka, but it's not like Suzuka's a bad circuit. It's fast and fun to watch.
I'm personally impressed with the JP crowd because they don't really have a history in the tac FPS genre. Seeing them come out for a game that they historically wouldn't have been interested in is pretty cool.
Also, regardless of your opinion about it, br fans can come off the wrong way with their chants. I believe there was a chant to NRG, saying "UH VAI MORRER." While obviously not a death threat, the JP crowd is normally respectful and doesn't do anything like that. Personally, I like a level somewhere in between the two extremes, leaning towards the BR side where fans are passionate for their home team, but still maintain a respectful demeanor. However, I can see why competitors might like the JP crowd more.