I don't use any of those sites to book travel, etc ..
It's like when using Priceline for a Car, I just get the price to see who has the best Airport location rental, then go to that site and Always get it cheaper
All you have to do is be a Member at that Car rental place.
I find that using these Hotel.com or Expedia type of places, there's mostly trouble or a problem a long the way.
and in most cases you can get a better deal with the Direct hotel or Resort.
Not loyal to any single booking site. Even used an actual travel agent last summer.
But 100% loyal to tripadvisor for information and to post my own reviews