I would first question whether or not you actually need a web version and if it might be a very different experience. I only say this because I wasted months duplicating my app experience to the web and less than 1% of users use the web version regularly.

I've worked with React Native for iOS and Android and would recommended it. It's a huge challenge to make complex apps feel as fast and slick as building in Swift, but that may be an issue with any js framework (and I may be biased from working in Swift also).

The popularity of React is another plus: it's easy enough for a web React developer to learn React Native.