I use Designer Whey "natural" flavor. It doesn't have anything artificial, including no sweeteners.
If you don't mind the sweetners and other ingredients, Syntha 6 (vanilla ice cream flavor) is a basic good tasting and quality protien powder. You can mix it with yogurt for a pudding or for a sauce.
The "natural" sweeteners that have low or no calories are put in almost all protein powders and anything sweet and "healthy," (including Syntha 6). Unfortunately, they can cause reactions in people, including anxiety. Since I have that problem to start, I don't want to take a chance.
Designer Whey "natural flavor" isn't horrible tasting, just cardboard. It does taste good mixed with natural organic juices, which I use as an after workout shake, to get equal carb and protein, no or low fat...as part of my program designed for my personal needs (complicated) by my trainer. I don't like how it tastes mixed with other foods, so if I must, I just drink the whey protein with water and leave the rest of the meal tasting good.