I felt that SP had more to offer in terms of exploration, food, shopping, things to do etc. I also get the impression that its a bit safer than Rio??
And the online section of GPs seems better in SP from what I've seen although this is probably misleading. .....I also have a friend in SP.
No doubt I will return another time and spend more time in Rio and other cities. But for now I'm happy with a few pics of Rio for insta - unless I meet the love of my life there haha