Do the different "types" of shampoo and conditioner, like for "smoothing" or "volume" or whatever, actually make a difference in appearance or texture of hair? I've tried several different ones, and I think I've noticed a difference, but I'm not sure. I have used two different versions of the same brand consistently, and I think one makes my hair thicker and stay in place more, while the other makes it loose and stringy. But maybe it's just my imagination, or changes in humidity or something.