Each brand has their own recipe, IO and Oceanic are 2 good ones, with Crystal Sea being "considered" the best. I like oceanic the kind that is liquid form. But depending on what type of saltwater you keep, on which brand you should use. Red sea is good for FO or FOWLR, but IO is better for a reef because of trace element value in the mix. Myself for my reef, I go to the LFS and buy saltwater from them. They have a 1500 gal R/O salt container that they sell for $.95 a gal. And when you can't hardline an R/O this is the easiest way to do it. Considering that salt mix cost about $.50 a gal, and Distilled or R/O water cost about $.50- $.75 a gal.
