This reminds me of Boyer Coe: “I would have eaten horseshit if it made me grow”! 
On a serious note I agree that taste is secondary. I look for a decent product at the right price. In practical terms, whey isolate from an internet seller in a big bag. Being a high carb dude, I often blend it with a decent carb (Vitargo for instance) - also bought in a big bag. Then you have a gainer!