Both Flutter and React Native are mature, capable ways to ship to iOS and Android from one codebase. The honest answer to 'which is better' is that it depends — but on fewer things than most teams assume.
Flutter renders its own UI, which gives you pixel-identical screens across platforms and smooth animations almost for free. It is a strong default when the interface is custom and motion-heavy, or when a consistent look across devices matters more than matching each platform's native feel.
React Native leans on the JavaScript ecosystem and the native components of each platform. If your team already lives in React, or you want to share logic with a web app, that gravity is real and worth respecting.
The decision that actually drives the outcome is usually not the framework — it is the team. The stack your engineers already know deeply will ship a better app, faster, than the 'technically superior' one they are learning on the client's time.
We build in Flutter most often because it fits the product-heavy, design-led work we take on, and because one team can own the whole app. But we keep React Native on the table, and the questions we ask first are about the product and the people — not a benchmark chart.