I have never created an apps or worked with React Native before. But, I would share the experience from my colleague who develops Android apps in our startup.

We are a startup that helps people in the middle-low income using technology. The people who use our technology usually have Android mobile phone with minimum specifications (Jelly Beans, low memory and spaces). At first launch, we used Android Native to build our application. The application meets our costumer needs since we consider to build an apps that consumes low memory and spaces. Then our costumer are growing and the features are complex, we use React Native to existing native app. Our application now consumes memory and spaces two times than Native one. Beside that, sometimes when you use a library, Native is more stable than React Native.