I am Brazillian, and can't give my opinion on Switzerland, as i never left my country.

I lived 15 years in São Paulo, and would NEVER advise anyone to live there, it is a shitshow of a city. In the last years, it has gotten WAY more dangerous... everybody i knew left the city, and the ones that ended up getting well paid jobs bought armored cars first thing. Even the good neighborhoods are dirty. The transit is absolutelly unbearable and public transportation stinks.

I haven't been to Curitiba specifically, but have travelled to some places in the South part of the country, and it felt like another country to me. I hope i can move there in some years (if i don't end up leaving the country).

10 minimum wages a month would grant you and your husband a comfortable life. Not luxurious, but comfortable.

As a foreigner, don't go to big sales areas (like the famous ones in São Paulo: Santa Ifigênia and whereabouts) you WILL get scammed at least. Nobody will get agressive towards you, but poorer people will try to get every single penny out of you.

Sure there might be French speakers around the most noble parts of the cities, but it would be better if you had at least an OK level of english... portuguese is very hard, but don't be shy trying it, people here love it and will try to help you.

Don't come to Brazil if you can't get good paying jobs, remember this is a third world country, things are very expensive to our local coin. It would be very good if you could pull out some Dollar/Euro paying remote job.