If your app is targeted to a particular demographic it's always best to stick with that rather than generic "mobile app site". So for example if you wrote an ap

If your app is targeted to a particular demographic it's always best to stick with that rather than generic "mobile app site". So for example if you wrote an app for amateur dog training, it's best to promote it where the new dog owners hang out, rather than where iPhone users hang out. Depends on the app of course. If you can't think of particular audience, that might be an indicator that you didn't think it through.