I am sure I read a thing saying the regional leagues in Brazil were considered a better standard than majority of the european leagues at time.
Would need to try and find the article.
I am not football historian but football in general aren't the same b4 and after Bosman laws .nevermind back in 60's .the currents stereotypical top leagues and some super rich teams weren't back then (By that I mean many strong teams ahead of others Like Barca ,RM,Chelsea Bayern currently .there was obviously super team in some eras who was able to win CL 3 times in row)
Brazilian league was strong back then .CL and Liga/EPL/Calcio aren't as strong as now .that is all true .the leagues was more even back then
That said .right now you have 2 clearly top leagues in the world who separates themselves from the other .The CL is the competition with the most of world's top players .that mean playing in CL/Liga right now is more difficult than playing in Brazilian leagues even in retrospect to the difference in eras .those leagues back then wasn't as saturated with top players/coaches as it is right now