Ginger beer is the preferred bubbly soda to include in your bourbon mule. It has a pronounced, spicy ginger flavor. Ginger ale, on the other hand, is sweeter and has a more subtle flavor.
Can I use another type of alcohol instead of bourbon?
You can, however, when you swap the bourbon out you'll be making another variation of a mule. For example, a Moscow mule uses vodka and a Mexican mule uses tequila.