The amino profile and chemical make up of the 3 brands mentioned are the same. (the amino profile has to be the same to be human) It is my opinion that the perceived differences in results has to do with the steroids used, the diet, the training, and the genetics of the individual reporting, not the brand. Remember, GH does not cause gains.........it allows a person using steroids with a high calorie intake to gain lean mass. GH alone will simply lean you out. Nor does it cause water retention....but the gear used with it may.
If I used each brand in seperate cycles, for example, and used insulin with one and not the others, my results would be strikingly different, and I might think the one was better. Or, if I used heavy test with one and simple anabolics with the other, my results would be different....and so on. I come to this conclusion after years of personal use in many different combinations.
Bottom line......get the best price per iu you can get, and you will be happy with any of the 3 brands listed. Currently, Serono is the least expensive, because it is the kit of choice for HIV therapy, and is readily available.