In React Native, you can use the same code for deployment on iOS as well as on Android,it saves time also. It builds on the React ideas and allows you to create powerful mobile applications. These days react is the most popular cross platform framework for mobile development. the world’s leading comapanies are using react native .

Ionic is used as frontend and ionic is used for android,ios and windows phone .
Ionic framework demands over typescripts such as CSS, HTML, angularjs or javascript .
While react native is based on javascript. this platform is little slower than react native