Pepperoni
* Typically made with a blend of pork and beef
* Has a relatively mild flavor
* Is usually bright red in color
* Is typically sliced thin
Old world style pepperoni
* Typically made with pork only
* Has a more robust, spicy flavor
* Is often darker red in color
* Is typically sliced thicker
In addition to these differences, old world style pepperoni is often made with a natural casing, while pepperoni is typically made with a synthetic casing. This can affect the texture of the pepperoni, with old world style pepperoni having a more rustic, chewy texture.
Ultimately, the best type of pepperoni for you is a matter of personal preference. If you like a mild, bright red pepperoni, then regular pepperoni is likely a good choice for you. If you prefer a more robust, spicy pepperoni with a thicker texture, then old world style pepperoni is probably a better option.