Take a job in a developed country or start your own thing at home, a poor country

I'm for a developing country and now have an opportunity to work in a fintech company based in London. I know this would be a great opportunity financially for me and my family (married with one child). 

Thing is over the past months (>6 months), I've become increasingly uneasy about holding job - I have one right now and I have very little motivation.

So I would like to know your thought process if you had to decide as someone in his mid 30s with a wife and kid between taking a job that will most probably be not fulfilling but well paying at a country with more opportunity or staying home, take a risk and start my own thing and potentially saving more time. Thanks!
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