There is no universally correct mobile framework. The useful question is which approach fits the product's interaction model, platform requirements, existing team, and expected maintenance.
React Native and Expo
React Native is a strong fit for data-driven applications such as forms, lists, dashboards, collaboration tools, and mobile companions to a React web product. A shared TypeScript codebase can reduce duplicated product logic. Expo can simplify builds and release workflows, while native modules remain available when a feature needs them.
The trade-off is that platform-specific behavior still needs testing on both operating systems. Dependencies that rely on native APIs also need to be checked before committing to a release plan.
Flutter
Flutter can be a good fit for custom, animation-heavy interfaces where consistent rendering across platforms matters. It introduces Dart and a separate ecosystem, which may be a sensible trade when the product's visual language is the main differentiator.
Swift and Kotlin
Native development is the clearest choice when the product depends on platform APIs, deep hardware integration, or platform-specific interaction. It also means maintaining separate implementations and coordinating feature parity.
A practical decision
List the product's hardest interactions, device capabilities, offline requirements, release constraints, and team strengths. Prototype the riskiest one or two flows before choosing. Re-check framework and platform documentation during implementation because APIs and release tooling change.