you need to go with the native languages for the best experience. With MonoTouch, you still write against the native iOS UI. Therefore, from the user's perspe

you need to go with the native languages for the best experience. With MonoTouch, you still write against the native iOS UI. Therefore, from the user's perspective, your app is native. Since the UI is the same, the only thing that could be different between an ObjC and MonoTouch app is performance. In my experience there's no noticeable performance hit with MonoTouch except for app startup time (my MonoTouch app takes about 2 seconds to startup on a 3gs)