With that said, I think that Tectoy's numbers really count. And, being Brazilian, I'm pretty sure that by the end of 1993 (at maximum) Mega Drive have sold here more than SMS.
You have to remember that SMS was launched here in 1989 and Mega Drive at 1990. SMS did not have many time to be the "king" of consoles in Brazil...
Just take a look:
http://jogos.uol.com.br/infograficos...uol-jogos.jhtm
The guy talks about the partnership with Sega, Tectoy's history, Sega's history, etc...
During the video, a photo with the guy, another guy from Sega and Ayrton Senna is showed...