Framework7 vs Ionic vs PhoneGap

As a startup, we need the maximum flexibility and the ability to reach our customers in a more suitable way. So a hybrid application approach is the best because it allows you to develop a cross-platform application in a unique codebase. The choice behind Ionic is Angular, I think that angular is the best framework to develop a complex application that needs a lot of service interaction, its modularity forces you (the developer) to write the code in the correct way, so it can be maintainable and reusable.

While with Ionic it is possible to make mobile applications with only web technologies, Flutter is more performant and is easy to use if you are willing to learn Dart, which is a fun language. Plus, it has awesome documentation and, while its ecosystem isn't near as big as JavaScript's is, it has a good package manager called Pub and its packages are generally high quality.

Greetings!

I have been searching lately for frameworks to build mobile apps.

We are trying to make something like a quiz app as a way for customers to contact us. I considered Ionic and React Native because we use JavaScript most of the time in websites, e.g., Vue.js/Nuxt.js. But Flutter seems a decent choice as well, especially since you can use Android/iOS-like components. We are looking for something that works in the long term, something that's time and cost-effective, especially when paired with backend services like Firebase or a GraphQL server. I would like to know your opinions and recommendations. Thank you!