We run both - app and website. Both have very similar features however navigating in the app is different. Also things like subscription (because Apple iTunes ) is quite different. Now the same topic for web and app is in one article which is divided into two sections.

Any ideas on how to route mobile app users to a collection with hints for mobile app and website users to another article collection?

An audience rule is not an option as it hides articles completely if you don't fulfill a condition. Users should always have access to all articles, it'd be just very useful to be able to distinguish users from different platforms and to display different sections/collections to them first.

Thanks for sharing your ideas.