Each one has its own unique style.
Many people own a variety of decks for different purposes.
Some like to collect decks. There are thousands in existence, although many are rare or obscure. Even if you plan to stay with just one deck for your readings, it is still fun to see how different deck designers view the archetypal themes of the cards. The decks I offer are grouped alphabetically by name. From there, you will be able to see more information and sample cards for any deck that interests you.