I have only superficial experience, but the biggest benefit of typescript over flow is the tooling. It is easy to setup, with transpiling, JSX, linting, webpack

I have only superficial experience, but the biggest benefit of typescript over flow is the tooling. It is easy to setup, with transpiling, JSX, linting, webpack loader all bundled together, while with flow you have setup a lot of different components yourself, which may not interact well with each other.