Why??? It is 4% different. What, that is like a gram per scoop. Are you measuring your scoops that close? Or are you weighing your whey (no pun intended). Numbers can be decieving. If it is less expensive then you are prolly money ahead. All things being equal, I will choose one that tastes good over a few percent. Furthermore, I am not sure why folks seem to like ON all that much. I have tried 3 different ON flavors and did not like any of them. I ended up mixing with ATW to get is to taste better. But that is just me.