Comparing McDonald's Sugar Free Vanilla Latte and Cappuccino, both coffee beverages offer a great caffeine kick, but their flavor profiles differ. The Sugar Free Vanilla Latte, with espresso, steamed milk, and a hint of sweet vanilla, offers a rich, creamy, and mildly sweet beverage. It's ideal for those wanting a touch of sweetness in their coffee, but keeping sugars at a minimum. The Cappuccino, made with espresso, milk, and milk foam, showcases a classic Italian coffee, providing a slightly bitter taste enhanced by the dense, velvety foam and less milk than a latte. For fans of stronger espresso notes, the Cappuccino is a fine choice. Ultimately, preference depends on taste, desired milk-to-coffee ratio, and preferred level of sweetness in your coffee drinks.