It's always towards the state management, it would be best to use either Bloc/Cubit or Riverpod for that matter, instead of ChangeNotifier provider and here's why:

1. Bloc/Cubit is made for business logic component for managing the states of the properties and events that will trigger for them and using the UI to either get it or set them before changing the visual state.

• Bloc is more suited for BE requests and SQL query operations, it's heavily use only to get requests from async operations using Events.
• Cubit is a lighter version of Bloc, but it consists with State and Just a Cubit for storing methods of calculations or other methods that will trigger something in the background.

2. The riverpod is simpler, but a bit confusing at first, but as long you use only one class to manage states and methods business and calculation behind the UI, it's best suited.

3. ChangeNotifier is a beginner level learning state management tool, you only use this for one single class to manage the state properties and the methods you required to make your UI clean.

4. Stateful state management tool is a very old way of managing the state through the UI and make your code very long to read and very slow.

If I was in your situation, I would start learning more about Bloc or Riverpod for the features you wanted to implement.

IMPORTANT: Always use state management tools for making calculations, manipulating strings, controllers, the click of a button to do something and etc. While the UI is only representing to the user and just getting and sending some data towards the state management tool. It's like have a contractor for your UI to work with and provide necessary data to present it to the user.