Rules to Better Ionic (mobile) - 1 Rule
There are many mobile app dev tools you can choose from. It's important to pick the best one for your needs:
Bad Example - Personal Web Apps (PWAs) show enormous promise for the future but currently do not support iOS 
Figure: Good Example - Choose Native for the very best experience and if money is no object 
Figure: Good Example - Choose Xamarin if your team know C# & XAML and you need a native app 
Figure: Good Example - Choose React Native if your team know React and you need native app feel without the development overhead 
Figure: Good Example - Choose Ionic if you are building enterprise applications, need a web app + mobile app, or your team know Angular, React or Vue