Processed sugar is extremely bad, so much so that there is a group of doctors that want to have it outlawed as a food. Sugar substitutes are a wild card. They are chemicals we have no idea how they will affect the body in the long run or what damage they may be doing.
Sugar is not avoidable in our society but the more you can limit it the better. It's probably best to avoid sugar substitutes all together. Honey is the best bet where- ever possible. Your body can process it easily and it is, in fact, the only food that never goes bad...in other words we can always eat it. To me this shows we have a long history of consuming honey.