Actually, that is a breeder's preference. I don't believe there is such a stigma with Americans in the Swiss breeds as there is in Nubians. I USED to be a dyed in the wool...PUREBRED Togg breeder. Couldn't give me an American...then Sun-Kissed Madam Razz-AT hit the scene! WOW Now, I have American Toggs to incorporate the improvements to the breed and go back with a Purebred buck every so often to keep head/ears/color true.
I for one don't really care what letter designation is in front of O,S,T....just conformation.