1. HFCS is more fructose (not by much, but enough) and it is the fructose that is bad for you. The sugar is also bad. They are BOTH bad.
2. Fructose inhibits the body's ability to know that it is full so you eat more calories
3. Fructose is mostly metabolized by the liver, other sugars are metabolized by all the cells in the body
There's no valid argument that says that sugar is anything more than nominally better than HFCS. THEY ARE BOTH BAD when used out of moderation.