i think the sugars and calicos are allelic, just different lines. although sugars tend to appeal to me a little more because of the high white, i've also read somewhere that the amount of white on them varies like with the pieds... so i don't know how the sugars always seem to be higher white. someone correct me if i'm wrong.
as far as the 2 gene enchis, i'm really diggin the lesser/butter enchis. lol