The type of whiskey you use in this recipe can greatly affect the flavor profile. For example, Scotch whisky (without an 'e') has a smoky flavor, is made from malted barley, and is distilled twice. On the other hand, Irish Whiskey has a smoother flavor with notes of honey, is made from a blend of malted and unmalted barley (usually), and is distilled three times, attributing to its smoothness. Next, we have bourbon. Bourbon is a popular choice for whiskey sours because of its sweet vanilla notes that beautifully contrast the sour elements. Finally, we have rye whiskey. Rye is a bit spicier than bourbon and has a more peppery, clove-like essence. So, to answer your question, it depends on what you're looking for in a flavor profile. Irish Whiskey or Scotch Whisky will be your best bet if you prefer less sweet spirits. On the other hand, if you like a sweeter flavor profile, bourbon might be the way to go. Lastly, rye whiskey is an excellent choice if you want to add a hint of spiciness to your drink!