Hilton’s Q3 promotion is a lame Double Points/Miles. You earn double base points/miles on your stays. This translates to 10points per $ if you choose double points and at least 1000 miles on most airlines if you choose double miles.
Choose your promotion judiciously since you won’t be able to change it later. If you are choosing double miles, remember to set your earning preference to Points+ Miles. Also, bear in mind that stays with Hampton Inn/Home2Suites/Homewood Suites earn 0-250 miles with most airlines. So it is better to choose Double Points if you would be staying mostly with these brands.
If you pay >$100/night for hotel rooms this is good promotion for you. As for me, my travel is mostly to various parks where there nearest Hilton is bound to be a Hampton Inn ~$80. The Q2 promotion of 1000 bonus points/night suited me better since I got points even on reward stays. Not with the Q3 promotion. You get zilch on reward stays.