savyounts

Universal Link vs Deep Link: https://www.adjust.com/blog/universal-links-vs-deep-links/

https://developer.apple.com/documentation/uikit/core_app/allowing_apps_and_websites_to_link_to_your_content/defining_a_custom_url_scheme_for_your_app    
NOTES FROM APPLE:Important

While custom URL schemes are an acceptable form of deep linking, universal links are strongly recommended as a 
best practice. For more information on universal links, see Allowing Apps and Websites to Link to Your Content.
(Universal links only work for for Apple devices and available on iOS 9+)
Enabling Universal Links:
https://developer.apple.com/documentation/uikit/core_app/allowing_apps_and_websites_to_link_to_your_content/enabling_universal_links