Not sure this is directly related or not, but my Ponto audiologist explained to me that the center for speech is in the left hemisphere of the brain. Sound input from our ears goes to the opposite hemisphere. Therefore, if your good "hearing" ear is the right ear, input goes directly to the left hemisphere, where the speech center is located. If your good ear is the left ear, the sound input must first go to the right hemisphere and then the information back to the left side speech center. Although this all happens very quickly, it is one additional step the brain must take to recognize speech.
She went on to say that if you had to be deaf in one ear, it was slightly to one's advantage to be deaf left.
Bottom line: it is all in how well any person's brain adapts to new sound inputs when wearing a Ponto, BAHA, Cros, or Transear. Many, many variables here.
Clarice