If I’m not wrong NativeScript’s adoption on TypeScript / Angular / Vue are purely to encourage people form those background to reuse their skills. The documentation is designed in a way that assumes the developer has prior knowledge on that particular framework. Often times most people expect the NativeScript’s docs to explain them the framework specific features which is not quite possible.
Yes, of course NativeScript is more promising than ReactNative. So I would suggest to choose Angular if you are really not well versed in Vue already as it’s easy to find more resources for NativeScript Angular at the moment.