Very good question. I have some experience with this having done a number of searches for a family member with depression. I have found that the individual's fit to the style of treatment is more important than an internet review or a national ranking. You should use knowledge of the patient to determine what you look at. First, treatment for PTSD can be different for a patient that has aquired PTSD from a recent trauma and has no other psychological diagnosis, or other nerve/brain related diagnosis. This is different than someone who has experienced longer term trauma and has what is called "chronic PTSD". Other considerations are age, ethnic or religeous preferences, and any issues with communication. For instance someone who has a strong preference for privacy and one-on-one treatment, or someone who feels that they need to be around others with similar illness and circumstances.
The big names in the country include Boston's Massechusettes General, the Menninger Clinic in Houston, Texas, and the Mayo Clinic. These large organizations would have a lot more services available to consider other medical problems along with the PTSD, and may have a particular unit for specific diagnoses. They can be intimidating and seem too clinical for some people. There are a number of places that cater to specific diagnoses in the "mental illness" category. Sierra Tuscon was the gold standard for a long time. New management has changed the original character of the place, and, in my opinion, not for the better. Many of the smaller - and cozier - places are ideal retreat-like environments, but tend to cater more to addiction treatment even though they also treat other disorders. This is not necessarily bad, because most serious psychological issues require similar self discovery and creating a healthier, happier you.
There is also a huge expense differential as well as who might accept your insurance or make payment arrangements. Don't reject the government sponsored programs either. They usually have little or no glitz, and would include people of many different backgrounds, and all with valuable things to share from their own life experience and wisdom.
I recommend you start with deciding what you can afford, then a location. The location can be a very broad area, like the whole state, or more limited, like in your insurance network. Then compare all the programs for the factors above. You probably won't find the "perfect" place, but you do have choices. If you can, have a friend or relative help you with this search. A second pair of eyes can be valuable, and a second opinion, or third and fourth never hurts.
I’m happy to help further over the phone at https://www.6ya.com/expert/betsy_0a20bad2d178c082