The weight you put on is a function of overall caloric intake, not how much you consume in a given window. No postworkout is better for mass than the next. If you want an easy way to pack on pounds, drink whole milk with your meals and take 2 cups whole milk + ground oats + a scoop of your favorite protein powder postworkout. Add a banana or some honey for taste.
This is great advice.
Try looking up some recipes for homemade weight gainer shakes. Good ingredients are protein powders(most use whey), waxy maize, ground oats, bananas, peanut butter, milk(whole milk for a bulk), powdered milk, raw pasterized eggs, ice cream, creatine poweder, glutamine powder, yogurt(preferably greek), cottage cheese, olive oil, coconut oil. Throw it all in a blender and add up the calories/protein/carbs/fat. Take a big serving post workout, then throw the rest in the fridge and sip on it all day as a snack