The platform you want for your mobile application depends on a number of factors, including your target audience, your budget, and the features you want your app to have. If your target audience is primarily iOS users, then you will want to develop your app for iOS. iOS has a smaller market share than Android, but it is generally considered to be a more premium platform. This means that iOS users are more likely to be willing to pay for apps. If your target audience is more diverse, then you may want to develop your app for both iOS and Android.
This will give you access to a larger market, but it will also require more development time and resources. If your budget is limited, you may want to consider developing your app for a cross-platform platform like React Native or Flutter. These platforms allow you to develop one app that can be deployed on both iOS and Android. Finally, you need to consider the features you want your app to have. Some features, such as augmented reality or machine learning, are only available on certain platforms. So, if you want your app to have these features, you will need to choose a platform that supports them. Ultimately, the best platform for your mobile application is the one that best meets the needs of your target audience, your budget, and the features you want your app to have.