For weight gain, it is best to choose protein powders that are high in both protein and calories. Mass gainer supplements or weight gainer protein powders are often the best options for individuals looking to gain weight, as they contain high amounts of protein, carbohydrates, and healthy fats, which provide the necessary energy and nutrients for building muscle and supporting weight gain.
It's important to keep in mind that weight gain supplements should only be used as part of a balanced diet and exercise program, and that the best approach will depend on your individual goals and needs.