It varies. I usually get whatever is the best value. I figure that it's basically the same stuff in most of them and they seem to work fine for me so yeah.
Do you know that too much shampoo, conditioner and even bath can kill your hair? I use to rely Dry shampoo a lot until I read this article. Now I trust natural herbs for hair wash. I heard rice water also helps. Try any natural remedies rather than the chemical options.