nitrotech is 97% whey, so there isn't a huge difference there. but nitrotech is said to have beneficial androgenic sideefects (NO increase). but personally i have, in the past, taken 2 tubs of nitrotech and seen no other benefits besides protein.
take a protein shake (whey) right when you wake up, right before, and right after your workout.
casein should be taken right before bed.
throughout the day just go with anything with protein. chicken, tuna, lean beef, lean pork, etc..