The best mobile platform for developing a travel app depends on the purpose of the app, the targeted audience, and the resources available.
For an app with a broad user base, Android is the most popular choice. It has the largest installed base of users, so it is likely to reach the most people. Android is open source and easy to customize, so developers can create a unique experience for users.
For an app that needs to be very interactive, iOS is a good choice. iPhones and iPads have powerful graphics and animation capabilities and support a wide range of features. It is also the only platform that supports the Apple Watch, so an app could be designed to synchronize with the watch for an even more immersive experience.
For a travel app, it is also important to consider the global reach. Android is available in more countries than iOS, so an app on this platform would be more likely to reach a wider audience.
Ultimately, the best platform for a travel app depends on its specific requirements and the resources available. An experienced developer can help assess the needs and decide on the best solution.