What cocktails can I make with grenadine, egg white, simple syrup, and bourbon?

From the list of cocktails provided, the best match for your preference that includes grenadine, egg white, simple syrup, and bourbon would be the New York Sour and the Boston Sour.

The New York Sour is an elevated take on the classic Whiskey Sour, incorporating a float of red wine for a distinct fruity layer that complements the bourbon base. It features lemon juice, sugar syrup, egg white, and of course, bourbon. This drink has a high rating of 4.75/5 and offers a sophisticated and visually striking layered presentation.

Alternatively, the Boston Sour is another excellent choice. This cocktail essentially modifies the traditional Whiskey Sour by adding egg white to create a smooth and frothy texture. With a rating of 4.56/5, the Boston Sour combines tart lemon juice, sugar syrup, and bourbon, creating a perfectly balanced, silky cocktail that is as pleasing to taste as it is to look at.

Both of these cocktails offer a blend of sweet, tart, and creamy elements, making them well-rounded choices for someone looking to enjoy a sophisticated bourbon-based drink.