The longer – and more oblique – answer is that it depends. On what? On personal preference, taste, sentimental attachement, etc. Some Bedouins fancy a particular strain because it was owned by their father or their grandfather; others because horses from this strain ahve achieved fame in combat, and made the name of the tribe rise above its neighbors’; others might favor one strain over another because it is rare.. Personally, I confess having a soft spot for two strains: Kuhaylan al-Wati and Kuhaylan al-Sharif, none of which are represented in Western Asil Arabian breeding. I like them because of their glorious histories and because their origins go a long, long way back.
The short answer is yes. Because strains are just family names given by the Bedouins to Arabian horses that are related through the dam line, there is no reason why one name should be “superior” or “inferior” to another (Is Smith better than Doe, or than Al-Dahdah?) It all boils down to the quality of the individual horse. Some horses are just better than others (I will defer the discussion of what my opinion of a “better” Arabian horse is), and if bred well, these horses may in turn produce better horses, and so on. Other individuals are less good, and if bred poorly, will end up producing inferior horses as well. If these individuals are females that in turn produce females so that the strains can be carried forward, then yes, the result in the very long run is one strain becoming better than the other. In essence, strains improve as a result of sound breeding over long periods of time, and degenerate otherwise. Nevertheless, all strains are all created equal. Lady Anne Blunt, who came as close in understanding Bedouin Arabian horse breeding as any other Westerner ever did, wrote that her stud manager, a Mutayr Bedouin by the name of Mutlaq al-Battal, never ceased to remind her than “All (strains) are…