One purchase criterion is the purpose for which you are buying your protein shake. If you want to watch your figure and reduce your weight, it is best to choose a protein shake that is low in fat and carbohydrates. You drink it when you get a craving and replace an unhealthy snack.
For intensive muscle building and as an endurance athlete, choose a Whey product that provides your muscles with the protein they need.
If you want to gain weight with the support of a protein shake, you can do so by consuming more protein than your body can use. Excess protein is converted into energy and ends up as fat on your hips.
However, this is a very unhealthy option and is strongly discouraged.