Pederneiras: Brazil has the best fighters
Andre Pederneiras coaches two UFC champions, bantamweight champion Renan Barao and featherweight champion, Jose Aldo. Those are the only two currently Brazilian champions, but he believes Brazil overall has the best fighters in mixed martial arts:
The Brazilian athletes are the best in the world, I have no doubt about that. With few condition of work that we have, we get these champions, this is something that you don't see in any other place in the world.
You watch a person fed poorly in his younger life, some who never took supplements, travel to the US and kick everybody's ass. The guy prosper without incentive and also while having another job, I only see this in Brazil.
Pedernerias makes a good argument, but what is the deciding factor? It would take some time to research the total win loss ratio for fighters by nationality. Brazil has two world champions. The United States can claim Demetrious Johnson, Ronda Rousey, Hendricks/Lawler, and Jon Jones as their champions. Anthony Pettis is of course American, but of Mexican and Puerto Rican descent and UFC heavyweight champion Cain Velasquez is Mexican, but also an American citizen.