What protein is best for building muscle and recovery after working out?

Whey Protein: Whey protein seems to be better than casein protein, as was proved by a recent research that evaluated exercisers doing resistance exercises training.Another study showed that more leucine is better for muscle building which is in whey protein and it rapidly digested and converted to amino acids, acts as signal to elevate muscle protein synthesis important for ongoing growth, repair and muscle buildi.