YMMV. I routinely use real sugar vs. artificial sweeteners, though used Equal when I was SMO. I couldn't tolerate the taste of artificial sweeteners shortly after DS, plus real sugar actually helps forestall fainting issues from low blood sugar and low blood pressure. I don't seek it out or eat it in mass quantity (other than the fully-leaded gatorade my PCP has me on to prevent fainting, I guess), but I do use a spoonful in my coffee, yogurt, etc.
I think most DS'ers avoid sugar, especially early on to maximize and retain weight loss results.
Of the low calorie sweeteners, normies and DSers alike can experience bloating and diarrhea from sugar alcohols (e.g. mannitol, sorbitol, xylitol, lactitol, isomalt, maltitol and hydrogenated starch hydrolysates (HSH)). I avoid these like the plague...
As to yogurt, my favorite treat, though it only has 6g of protein, is Maple Hill Creamery, Cream on Top Maple Flavor. Yum! I usually eat whatever full fat pre-flavored Greek yogurt with the highest protein count that I kind find on the shelf at the time. Hard to find full fat...