I have used three different brands of salts in the hobby.
The first salt was made by a local firm but I could not get myself to trust the quality. (I had no factual reason to distrust it, other than it just seemed like a really small firm for something that complex.)
Since I distrusted the first salt, I tried a bigger established brand name. I didn't find anything to be wrong with the salt but I had a hard time getting it.
I then tried the Probiotic reef salt from aquaforest & it helps enormously with keeping phos and nitrates down in the simplistic Nano-setup that I am keeping.
I sometimes supplement with the other salts from aquaforest because it is cheaper. It just makes the Nano gain algae growth, so I mostly use it as a backup salt storage in-between ordering bigger portions of the Probiotic salt, in case the order gets delayed, which makes me concerned about running out of salt at a bad time.
I would only change to another brand of salts, if it had equal bacterial activity as the Probiotics from aquaforest, since anything else leads to unwanted nutrients in the tank.