I use baobab and I hook it to react with baobab-react
Depends on what is being implemented.
I have small toolkits which didn't have a need for state of the art stuff. So I just let it be in a Parent Container. Otherwise, I take a pick from Redux or MobX if it is a long maintainable project in consideration.
My 2 paise.
Sergei
Learning ...
Of course Redux today is the most popular solution for some reasons, but is suffers from excessive, unnecessary complexity compered with MobX which is more simple, intuitive yet powerful.