Greek yogurt has almost twice the protein of regular yogurt and lower natural sugar because of a straining. Both are fermented with live and active cultures (probiotics) and great for gut health. Unfortunately some yogurt brands heat treat their yogurt, which kills the beneficial cultures. Read labels and buy brands without additives, like modified corn starch, pectin, carrageenan, or tricalcium phosphate, and without added sugar for the healthiest choice. The best yogurt is just milk and live cultures.