Answer:
Best is email address is used for edit or share link people you can specify
Step-by-step explanation:
Since new contacts are not synchronized with 365 drive then end-user have to use the only email address to share the link. If it is the old address or existing customer then end-user he or she can select the name. as best practices are email address is good to use.
To share the link in one drive 365 email address is to be used. At the same time, the end-user can also edit the email address. if end user what to end the email address on the name using the has to select edit options