[Buetol]

But the iOS simulator is very limited (no push notifications, no camera) and developping on device with android is better in my opinion (easy port forwarding so you can access you local server as localhost)

On the other side, with react-native you get an uniform debugging experience and easy re-usability of your components.

[Osis]

Regardless of what you choose, always check your app on real devices before shipping.

Simulators have come a long way but they still don't replicate the real world.