There must be a dozen different threads going on muscle tech products.
Cell tech is a creatine based product that is used to improve strength and recovery and muscle volume.
Nitro Tech is just a whey protein that is not much different than many others out there. You take this to get enough protein in your diet and for the convience since it is fast absorbed - especially right after a workout where you don't want to have to wait for the food to digest f you ate a regular meal.
In my opinion there is nothing magical about either product.
Cell Tech has a ton of sugar in it to force the body to have a huge insulin increase to help deliver the creatine into the muscle tissue right after a workout. Normally, if you are trying to lose fat you don't want a huge insulin spike like this since it immediately stops all fat burning. Most other companies use much much less sugar to do the same thing or use other forms of fast carbohydrates like starch or man made insulin emulators to produce the same effect with less calories. I am kind of "anti cell tech" if you can't tell - simply because it does contain so much suger. But if you are young an dweight is not a problem it might not be as bad in your case. But I don't recommend it at all.