If you're planning on having a number of authorized users on your card, top rewards cards are often not the best option to work with. (best.creditcard)
It's a limit on transferring points to other people — something that Citi is already much more generous with than American Express Membership Rewards (which only allows points transfers to authorized users on your card accounts) and Chase (which limits you to transferring points in a personal accounts to a partner). (viewfromthewing.boardingarea.com)
Previously authorized users on the Citi AAdvantage Executive Card didn't get Admirals Club memberships, while now authorized users on the card do get an Admirals Club membership as well, with full guesting privileges (meaning they can bring in their immediate family or two guests). (onemileatatime.boardingarea.com)