Both cards are based on the same turn key solution provided by Amex which includes all the same basic benifits. Only difference in the two cards are reward structure which are now almost the same with TYP being devaluded and the fact Chairman card gives you flight points and both use different concierge services.

Both cards have the same hotel and airline benifits and both have the same Priority Pass card.

Both can have there annual fee waived the differene is the price point at which BOA and Citi waive that annual fee at and that BOA and Citi handle there own CS calls, insurance claims and disputes.