Which is worse, sugar or corn syrup as an ingredient with milk.?

My daughter told me some kid in her cl wasn't allowed to drink Intense Chocolate Milke (per the teacher - not the child or parent) because the second ingredient was sugar. (At least the kid is drinking milk instead of Energy Drinks! Geez!). I had a jug of Intense Chocolate Milk and regular 2% chocolate milk in the fridge. The Intense had sugar as the second ingredient, the regular had corn syrup. Is one worse or better than the other?