Aquarium salt - Good, better, best?

[newreefer_59]

Have had my tank up and running for about 6 months now. Have a few small fish at this point (yellow tang and a blennie), some snails a few softies and LPS coral pieces. Will next like to proceed into more LPS coral and SPS as well as more fish, etc. Question: Like to know the best salt to use?. Are they all the same? I have used mostly 'D-D H2 Ocean Pro' and used 'Reef Crystals' once. From your experience, are there major differences in these or another brand I should be using. Many thanks.