All weight gainers are are protein shakes loaded with carbs.
I'd say skip the weight gainer shakes and just add a 1 cup of oats to your protein shakes (if you have a blender). That will be as good as any weight gainers out there, giving you complex carbs, fiber and protein.
Take a protein shake after your workout, and make sure you eat 6 times a day, get in 250 grams of protein and train hard.