Azure B2B Collaboration and SharePoint Server 2016

Hello -

I am trying to enable Azure B2B Collaboration for external users for a SP Server 2016 environment. So far I found three (3) different ways to publish the SP Server 2016 to Azure AD and integrate. I am not 100% sure at this point which one is the right/preferred/optimum way to accomplish this.  

1. Using Azure AD for SharePoint Server Authentication
   • Uses the option Create a new enterprise application in Azure AD non-gallery application
2. Azure Active Directory integration with SharePoint on-premises
   • Uses Create a new enterprise application in Azure gallery application “SharePoint on-premises”
3. Enable remote access to SharePoint with Azure AD Application Proxy
   • Uses AAD Application Proxy connector

Hope to get some guidance on this. Thanks

Ali.