Just my experience, so take it with a grain of salt.
I used most of the generic GH everyone on here was using years back that got great reviews, and always had some water retention. But I also had all the good sides that come along with it.
I've been on Karl's (Shiroxx)stuff for awhile now at 3iu's daily, and haven't had the first issue with water bloat.
I've never used any of the other newer guys selling right now that have received great test results, so I can't tell you my results would be similar to what I'm doing now.
So I think it comes down to trying them out for yourself as you never truly know what you are getting if it isn't pharmaceutical grade.
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