The only big difference between types of leatherbacks is the one between the American and Italian leatherbacks. Americans are often called American smoothbacks. The genetics that create the smoother/leathery back are different. Italian leatherbacks have a co-dominant gene, which means that if you breed a regular dragon with a leatherback, you will get 50% leatherback scaled and 50% normal scaled. American smoothback/leatherbacks come from a recessive gene, so you need 2 dragons that have the gene to produce babies that are leatherback scaled. I read that some consider the American version to also be co-dominant but I think they are just renaming the genetics originally developed in Italy. Both look the same so if you're looking for a pet, either is fine. If you are going to breed though, ask about the genetics.