Soy Protein or Whey Protein?

So much research is being done about protein supplement shakes, especially since so many diet and weight loss books advocate it. Hard to be sure just which is better. And whether one is better for men and the other for women. The "experts" can't seem to agree totally, but I'm beginning to think that if you follow almost any of the information far enough, someone is making a buck or two off of whatever they have written. In one sense, soy protein might be better for men AND women, but then you come across someone who says just the opposite. My opinion, having considered a ton of writing on the subject, is use either one, unless you have a lactose intolerance. Just use it in moderation, like everything else. Too much protein is very hard on the kidneys and liver. If you are using either one for weight loss, add a healthy dose of exercise to it, or you will be disappointed with whichever one you choose. If you are using protein shakes as a supplement to food sources of protein in order to GAIN weight and build muscle mass, don't overdo it. All the hype is just that, hype!