Are adjectives protein powders duplicate?

With so many different brands and a VERY broad price stock, what are we really paying for when we buy those expensive protein powders? What's the difference between the cheap protein mix and the expensive one?Are adjectives protein powders duplicate?
Types of grades.
Take Whey Protein.
Main ones include: Whey protein concentrate, and whey protein isolate.
The isolate contains more actuall protein than the concentrate and is more digested so to speak. I am not a fan of concentrate and it is usally greatly cheaper (usually like $5 smaller number than whey isolate per pound.
Now other types of protein include: Micellar casein, calcium casein, egg white, egg, hemp, soy, and the 2 whey. All have different grades, where on earth theyre from, their properties, pureness, ect.
TrueProtein.com and ProteinFactory i think are the two best surrounded by quality.
No, you hold to look at the total grams of protein. Some might say 27 grams but you enjoy to use 3 scoops, while others will read aloud 27 grams with solely one scoop. Also, some contain dairy, while others don't. Also, some enjoy splenda which is a required taste.
No, some are occupied with different fillers - you get what you wage for.