I tell ya the weight gainer I always had the Best luck with young fella is
Champion Heavyweightgainer 900.
Its 1000 calories and 50g of protein per serving (in milk).
If your a skinny fella that has little or no Fat it will work for ya.
Best thing is real food! Eat a lot of Steak,Pizza,Pastas,Potatoes
and use the Gainers as what it is a supplement, not a repacement for the real food. goodluck and happy eating.