Quality is key!

The alligator is less common and therefore more expensive as well as superior over the crocodile. With better softness, texture, firmness, and overall more uniformity in scale patterning alligator leather is highly prize as the top Crocodilean leather.

______

Alligators are specific to the Southern United States while Crocodiles are found in Central America, Egypt and Australia living in both fresh and saltwater, lending to its lack of luster among leather seekers. Thus Treccani Milano uses only the finest leather, which from the above information is clearly alligator.