Using a deeplink allows you to direct a user to a specific location in an app with context. Unlike Page URLs, this triggers a microflow to handle to deeplink request. This allows this solution to be customisable through the triggered microflow (page URLs don’t do this and therefore are limited to displaying pages).
Page URLs can be used in a similar way to direct users to a page, however, non-persistent objects aren’t supported with this method.
This form post gives some additional information on deeplink usage.
Hope this helps,