Do these cards resemble your offers?
http://www201.americanexpress.com/getthecard/compare-cards/popular-cards?eyetracking=true
If so there really only appears to be a couple of extra features on the gold card with regards to event / ticket insurance. Are your offers both charge cards like these? Charge cards do not allow you to carry a balance (i.e. you have to pay your bill in full each month) as opposed to credit cards that will.