To me, Hospira is the only option worth considering, since it's pharmaceutical grade, so you can be confident their solution is precise and accurate. Across many forums, I've noticed plenty of gelling problems with peptides, and I'd attribute 9 out of 10 of those cases to the bac water not being an accurate solution (0.9% benzyl alcohol). That's assuming it's genuine Hospira rather than counterfeit, because I've come across some fakes circulating on the market. With a consistent pH balance, then, you can always be confident your peptides won't be ruined. So in short, as others have said above, Hospira is the gold standard, and I've only used Hospira so far and have had 0 issues even with peps known for gelling problems, like tesa.