My team was assigned to test react native and native script. We found react native is able to meet our requirements. Building the same application in nativescript however, we stopped within 2 weeks. A simple application with 2 pages takes 5s to load on android. The CLI tool is buggy and there is no debug information provided at all if something goes wrong. There is no community support either so if anything goes wrong, praying is your best approach. Also due to the super poor community support, a ton of UI requirements couldn't be accomplished.

Overall I wouldn't recommend nativescript. It is 2 years away from where react native is currently.

If you cannot accept reacts patent issue, I recommend you look at xamarin or Cordova. Avoid nativescript, it's a complete waste of time at this moment