The benchmark question is the wrong one
Most comparisons open with frame-rate charts. In practice, both React Native and Flutter render typical business applications at 60fps on hardware released in the last five years. Unless you are building a game or a heavy real-time visualisation, rendering performance will not be the thing that decides your project's fate.
What actually decides it
Your existing team. If your engineers write TypeScript every day, React Native lets them share language, tooling, linting rules and often validation logic with the web product. The ramp-up is days. Flutter means learning Dart, and while Dart is a pleasant language, that is still a real cost paid by every engineer who touches the codebase.
Your UI ambition. Flutter draws every pixel itself, which makes elaborate custom interfaces and animation far more predictable across devices. React Native maps to platform components, which is an advantage when you want the app to feel native and a constraint when you want it to feel like nothing else.
Your dependency on native APIs. Both have solid bridging stories. React Native's ecosystem of community modules is larger; Flutter's tends to be higher quality on average. Check your specific needs - Bluetooth, background location, a particular payment SDK - before committing.
How we decide
We ask three questions. Does the team already know TypeScript? Is the design heavily custom or largely platform-conventional? Are there native integrations with mature support on only one side?
Two out of three usually points clearly in one direction. When it does not, we pick React Native, because sharing a language with the web codebase compounds over time in a way that is hard to appreciate at the start of a project.
The choice you can defer
Whichever you pick, keep business logic out of the UI layer. Validation, pricing rules and state machines belong in plain, testable modules. Do that and the framework becomes an implementation detail you could change later - which is a far more valuable position than picking correctly on day one.