If you want to analyze events and users across your business's website, as well as its separate apps for iOS and Android — how should you set up your account?

One property with one web data stream for your website and two app data streams, one for iOS and the other for Android is correct because Google Analytics 4 is designed to unify data across platforms within a single property, allowing you to analyze users and events holistically across web and app experiences. By configuring separate data streams for the website, iOS app, and Android app under the same property, you ensure consistent measurement, cross-platform reporting, and more accurate user analysis, whereas splitting them into multiple properties would fragment the data and limit unified insights.