1. Protein before bed feeds your muscles all night long. The slow release of amino acids throughout the night fights catabolism.
2. Not sure I understand this question, but whey protein usually has about 20 grams of protein, 2 to 6 grams of carbs, and 1 or 2 grams of fat per serving.
Meal Replacements generally have higher protein, carbs and fat. They are meant to replace a real food meal. Both are valuable in
building muscle. Whey is cheaper, MRP's at the right time of day are invaluable.
3. For whey protein only, I like Ultimate Nutrition or ProLab. For MRP's I usually go with what is on sale. My favorite is Muscle Link. The nutrution facts are very similar so I like these because of their taste.
4. It may be #1 mostly because of the taste as well as marketing.
5. Mixing with milk is OK.