Universal app that works on iOS, Android and the web is the fastest and most effective way if your app needs to live on the three platforms.

You get 90%+ code reuse. That means your React Native components UI, Logic and Routing work on the 3 platforms.

With that amount of code reuse you don't loose on the most important. Keep each platform with a native feel. On native the app use all the native constructs like native views and navigation and on web they fallback to the web counterpart.