Angular 2 NativeScript Vs. React Native : http://blog.backand.com/angular-2-nativescript-vs-react-native/

Ionic 2 vs ReactNative vs NativeScript

ReactNative Cons:

The process of conversion of HTML code to native code can be buggy at times, and to fix the problems, you need to understand ObjC/Swift.

NativeScript Cons:

Many plugins need to be downloaded separately for the components. Not all plugins are available or verified (i.e., thoroughly tested).

App size is much larger than ReactNative and Ionic 2. If your users have slow internet connection, then it may be a problem for you.

There’s no support of HTML and DOM in NativeScript, so you need to learn different UI components to build UI of the applications.