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Less drugs/guns/crime
More safe in general
People generally have more money, therefore nicer things
Streets generally cleaner, air and water also less dirty
More opportunities
More sights/things to do
That's about my list. The thing is though it depends on the individual you look at. I'm sure there are many people in Brazil with nicer lives than mine, but I would argue on the whole the average British person lives a longer, happier, healthier life than the average Brazilian. But again it depends on the individual as to what they need to live a happy life, as well as what they're used to.