I'm eager to know why React Native is so popular in comparison to NativeScript.
I guess it is because React Native got released earlier than NativeScript, and most of the React developers are already comfortable with the React library. So if they want to try out mobile app development, then they would eventually stick to React Native.
Expecting your comments, my fellow developers :)
Sriraman
Software Engineer @ LifeOn24
Some of the reasons are
Few months back, I have answered a similar question in hashnode. You can check the answer to know more about my opinion about the NativeScript and React Native.