In a head-to-head comparison, both Burger King's Smarties Shake and McDonald's Happy Meal Hamburger with Fries cater to different tastes and dietary preferences. The Burger King Smarties Shake, a limited-time offering, is a milkshake made with the iconic candy, offering a sweet, chocolatey treat. On the other hand, McDonald's Happy Meal Hamburger with Fries is a classic fast-food combination, featuring a miniature hamburger and fries, providing a savory, familiar taste. Nutritionally, the Smarties Shake has more calories and sugar, while the Happy Meal Hamburger with Fries has more sodium. Both options are convenient, kid-friendly choices, but the Smarties Shake may be more appealing to those with a sweet tooth, while the Happy Meal caters to those who prefer savory foods.