Been using Rocketmiles for a while now, surprised to see they aren't on PH yet. For those with heavy travel schedules playing the mileage game, Rocketmiles accelerates rewards by granting 1,000+ miles/night to the reward program of your choice.
Looks like they now support 21 mileage programs. From my experience, hotels are usually the same price you'd find elsewhere though there are typically less options. Don't think anyone has quite unlocked the right UI/UX for hotel booking yet, Roketmiles included but I have been impressed with the speed I can move around the site and their support has been great.
Hustle X
Trello
Trello