Ranked in these QuestionsQuestion Ranking
Pro Allows you to develop native apps
Pro Backed by Facebook
Facebook writes their mobile apps in React Native so the code base gets pretty thoroughly used in some highly demanding scenarios.
Pro More predictable control of the state
The one way data flow, makes it more predictable and easy to control.
Pro Cordova plugins
Large quantity of plugins to access native APIs without code nothing in native language.
Pro Large, friendly and active community
Ionic Framework is currently one of the most popular frameworks for hybrid mobile app development. This has resulted in a very large community of active users who contribute to the community by writing tutorials and answering questions.
Pro Free and open source
Ionic is free to use and open source, resulting in an active and helpful community of users and contributors.
Con Steep learning curve
Con If core team doesn't use a certain feature, it's not developed
Whenever there's functionality you need that they don't use in their apps, it's not going to get developed by them, even if it's obvious it should be in the core. They always say to either submit a PR or create a separate module.