I think the question you really wanted to ask is: Is it healthier to eat starch-based carbohydrates instead of sugar-based carbohydrates?
A good question, because sugar is not equals sugar. Common sugar is saccharose, usually from the sugar cane, consisting of one part of glucose and one part of fructose. Even if you'd ask about saccharose versus glucose, the answer would not be trivial, although both would be taken up into the blood very fast. But because fructose is actually more difficult to digest and stresses the liver according to several studies, it is certainly less suitable as food during competitions (exercises don't matter, at least if you're not suffering from fatty liver disease).
There is a good book from a Frenchman called "The Montignac Diet". The underlying premises are that if you eat sugars that don't spike your blood sugar, but are released continually from your gut into your blood, then your body will transform less sugar into fat, hence rather burn it. Each food has an unique glycemic index that stimulate different amounts of insulin in your pancreas: The higher the glycemic index, the higher the insulin, the higher the blood sugar spike after having eaten the food.
So, in the end, it does not matter if a certain food is starch based or sugar based: The only important variable is its glycemic index. Therefore you might wanna eat only food with a low glycemic index.
If you look closely at such a glycemic index table or here or look for one here, you will easily recognize that quite often, unprocessed food has a lower glycemic index than processed food.
So, as a rule of thumb, it's better to eat unprocessed food like raw fruits or cooked vegetables since their glycemic index is usually lower than that of processed food! (Note that fruit juice is actually processed, and baked potatoes are heated and therefore processed as well, which actually explains their high glycemic index because starch is being broken down into sugars through processing...)
Personally, if you want to loose weight, I'd suggest drinking no sugared beverages (only cold/warm water or tea) and eating no food with glycemic index over 55 (because brown rice has 55 and I'm not gonna exclude that...), so almost every vegetable and dairy would be allowed (considering you're not lactose intolerant ;-) but not much starch-based food which is usually named as "carbohydrate diet".