Let me lead with my bias; bison leather is amazing! There, I said it. Now, why is it amazing? For starters, bison leather is stronger than cowhide. However, we all know that cowhide is strong enough to meet almost all of our purposes; after all, it's leather. The real beauty of bison comes from the grain.
Bison leather is known for its raised pebbling. Depending on the tannery and the location on the hide of the pebbling, the texture can be large or fine. Plus, all that pebbling helps to make showcase the life of a wild animal. The bug bites, scars, and character marks all make sense on bison leather.
Some bison can be tanned to minimize the natural shrinking. These are some of my all-time favorite leathers. They feature a deep, rich dye and waxy top.
One last note, not all buffalo leathers are the same. Notice that I am using the term "bison" for this leather. There is only one animal that can be called bison. However, the term buffalo is used for both the bison and the water buffalo. This might not be a big problem with the exception that water buffalo has been used in commercial leather production for a very long time. The only way to ensure that your "buffalo" wallet or handbag is "bison" is to order a bison made product.