Dark chocolate has a higher cocoa content—50–90% compared to 10–50% in milk chocolate—which confers more antioxidant benefits.
Milk chocolate usually contains a higher amount of added sugar compared to dark chocolate, which means that less sugar is wasted on meaningless calories.
They both have fat content, but milk chocolate frequently has more dairy fats than dark chocolate, which gets its healthy fats from cocoa butter.
Dark chocolate has more fiber, iron, magnesium, and flavonoids, which enhance heart health, whereas milk chocolate contains fewer of these nutrients.
Dark chocolate has a stronger, more bitter flavor, but milk chocolate is creamier and sweeter due to the increased milk and sugar content.