One of the links in the course article Access: IP Readers vs. control panels is not working.
For background, we recommend you review 2 vendor's pitches on this debate:
HID makes the case for the edge in a video introduction
Mercury Security rasises concerns and issues with the edge in a white-paper
the link to the Mercury white paper is broken. I tried to follow but got the following error:
Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, webmaster@mercury-security.com and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log.