If you are exclusive to US and Marriott, you might consider paying for everything US on this card and everything Marriott on this card. This will help accelerate elite status, as well as offer special earning bonuses and other perks that you wouldn't get from using cards not branded by the companies in question. Also, be sure to sign up for all promos that are announced for either program. Flyertalk is a great resource to keep on top of what promos are active.