I have gotten a lot of questions regarding Greek yogurt vs non Greek yogurt so here is what you need to know.
Both are made by adding cultures to milk. The difference is that Greek yogurt is strained to remove the liquid portion of the whey. Yes, as in whey protein. The whey protein that is left is a more concentrated substance which typically gives you 15 -20 grams of protein per serving. Most regular yogurts only contain 5-7 grams of protein per serving. The reason Greek yogurt typically costs more is because more milk is needed to produce it. Some yogurts are high in sugar because of the natural sugar found in the fruit used in the product.
Not all are created equally so please read your labels! Regardless of which you choose, do not choose yogurt with added artificial flavors, high fructose corn syrup, sugar, splenda, aspartame and other fake sugars or cream.
Below is a link to a great (short) article on eating mistakes people make before and after workouts. I think the author gives some good information.