I always try to read the labels carefully when comparing products.

Each company will always claim their product is superior to get more people to buy it.

The only thing I can advice you is make sure you are comparing apples to apples ie whey isolate with whey isolate, grams/scoop, cost, etc.

I am also particularly cautious of "proprietary blends" as the exact ingredients and quantities can become fuzzy.

-Cheers