As mentioned, we are not comparing apples to apples. Hampton is in a different class than Days, HoJo's, Comfort, etc. In terms of consistency, I've found that Hampton's are among the best in the lower mid-market category; however, rates tend to be much higher than Choice hotels (e.g., Comfort, Quality, Clarion) or Cendant (Days, Ramada, Super 8, HoJo's, etc) properties.
You would be best to compare Hampton's to Holiday Inn Expresses. With that said, I've found that both the Choice and Cendant frequent travel programs are inferior to all others. Their credit cards make earning a room more difficult than at a Hilton or Starwood property. In addition, I've had nothing but difficulty waiting for points to post, or having them post as points rather than miles. In all cases, the respective companies refused to re-post the points as miles correctly. With that said, points tend to take over a month to post. In addition, Choice only allows you to redeem points for hotel stays within 30 days of arrival. This can make planning a trip several months out a challenge.
I do prefer the Comfort Inn brand over the Cendant properties becuase they tend to be a bit more up to date/renovated. One never knows what one is getting with Cendant.
Fairfield Inn's are a different story becuase you have Marriott running the show, with a descent frequent stay program. Of course, it will taek quite some time to earn a free night with Marriott if you are only staying at Fairfield's.