Is high fructose corn syrup worse for kids than sugar?

No. There's been a lot of hype. The truth is, hfcs is 55% fructose and 45%glucose. Sucrose (table sugar) is about 50%fructose and 50%glucose. Glucose is used by our bodies as is. Fructose, on the other hand, requires processing by the liver to be used by the body. I recommend avoiding foods that contain a lot of either one. You get plenty of sugar in natural foods;you really don't need either one.
Yes. High fructose corn syrup is highly processed and can cause food craving.