starwood amex credit card with $100K limit, only primary cardholder can redeem starpoints and transfer to his frequent flyer programs. then he can book awards for other 2 partners.

american express business platinum charge card with OPEN savings, free business services, and membership rewards that allow ALL additional cardholders to be authorized to make membership reward transfers into their own frequent flyer programs

diners club MASTERCARD charge card. i do not know whether only primary can transfer, or whether all additional authorized cardholders can.

i personally plan on using all 3 cards when i start my own business.