Stevia is more natural than Xylitol. Xylitol has more chemical components and is considered an artificial sweetener as it is made from sugar alcohols, TBH I think it's as "bad" (even though I don't mind aspartame) as aspartame. They both have slight metallic tastes, but it really depends on what you prefer taste wise. Unlike Splenda/Nutra Sweet you don't need as much. My understanding is they have managed to form a type of Stevia that is minus the bitterness which can often be the offending after taste with other natural sweeteners.