Net carbs and sugar alcohols are (in general) going to get you into trouble. Carbohydrates cause fat storage, because to make triglyceride (to store fat) your body gets the alpha glycerol phosphate from the carbohydrates you are eating. From a biochemistry perspective (I taught biochemistry, and I did a fellowship in biochemistry before medical school), net carbs and sugar alcohols aren’t likely going to make a significant difference in terms of fat storage. Pay attention to the total carbohydrate content of what you are eating, and pay attention to how many calories you are eating. Everything else is pretty much smoke and mirrors, designed to sell diet books, and not help you lose weight.