Can anyone clarify the part about ranking the AMP page vs non-AMP? It's easy to get confused (at least for me) when they are talking about apps and pages.
In Google’s mobile search algorithm, AMP signals now trump the signals that app indexing sends. In other words, if a site has both an AMP page and a page within its mobile app for the same thing — an individual article or a product page, for example — then Google will stop ranking the app page and instead rank the AMP page.
Source:SEO: Accelerated Mobile Pages for Ecommerce