Making an app for the IPhone/Android, or is it better to make it for the web player?

I was just wondering, if I want to make an app, that will run on Android, and the IPhone, can I not just make the app for the Unity Web player, and then tell the user to access my app via the Unity Web Player via their phones browser?

Would this be the best way to do things or is it better to develop for the individual platforms?

The Unity Web Player is currently only available for browsers running on Mac OS X and Windows; it does not run on mobile platforms. So the only way would be to develop for the individual platforms.