I am always correcting people at the store I work at that they are not the same thing (it doesn't help that the nutritional yeast we sell shows up on the receipt as brewers yeast). I like Brewer's yeast just fine though, in a different way than nutritional yeast. I bet brewers yeast would taste yummy in homemade seitan. For sauces and stuff though I go for the nutritional yeast. Brewers yeast is, for lack of a better word, beefier, where nutritional yeast is cheesy/nutty. That is my take on it. If you bought it you might a well eat it, right?