Whey protein extreme 60 VS. Mass Peak?!?!?!?!?

can some1 help me, i work out around 4 days a week at the gym.I want to get BIG so i drink whey extreme 60, today some1 at the gnc told me if i want to get big i should use Mass peak, i dont know much about it but she said all that whey will do will build lean muscle. i want to get big faster without taking creatine or hhaving any water weight.!!!!!!!!