I am a member of both programs, but I tend to favor Marriott. I haven't kept up with Hilton's promotions too much. Marriott and Hilton have the same base point earnings (10 points per eligible U.S. $).

You can get MR points for up to 3 rooms. Per my Hilton manual, they give you credit for up to 2 rooms.

Marriott annually has the Megabonus Promotion in which you can earn thousands of points (varies among Silver, Gold, Platinum) for having a certain amount of stays.

They currently have the Double Points promotion in which you earn double points after your 2nd paid Visa stay at any Marriott brand which expires January 31st.

You can sign up for a Marriott Reward (MR) Visa Card and earn 15,000 points upon your 1st purchase. You earn 3 pts per $ spent at Marriott hotels and 1 pt. per $ spent elsewhere.

Does Hilton offer promotions like this?