The brand isn't particularly important when buying supplements. What matters is the ingredient list and supplement facts panel.
You really need to be a smart consumer in today's market and do your research. Look at the ingredient list and supplements fact panel on every supplement before buying it.
A good quality supplement will clearly list what is in the product with NO proprietary blends or formulas. They will list exactly what is in the product and in what dosages.
Take a whey protein for example- you want to see nothing but that in the ingredients list. Whey protein, natural flavours, a natural calorie free sweetener like stevia and then maybe some salt, soy lechitin and cocoa powder. There are a lot of good products on the market. I personally use isolation from n2bm.com. A good whey isolate should be pretty much fat and carb free. Isolation has 26g protein, 1g carb, 0g fat per 30g scoop.