There are many good salts out there. People like them for different reasons. For price, seems a lot of the time both the Red Sea and Instant Ocean Reef crystals are on sale a lot and are very popular
OCeanic ( what I prefer and use) has excellent stats as it is a bit higher in Calcium than a lot of other brands, and had the right Magnesium level.
H2H has a salt that reviewed very well last year when I was at Macna, but it was a bit expensive. Same with SeaChem's Salinity (which I also like a lot).
Instant Ocean (not the reef crystals blend) is really more for a fish only tank.
I advise you too look at the labels for Calcium, PH, and Phosphate amounts at 1.025 for whatever your looking at. PO4 should be low, PH 8.0-8.2, and Calcium at least 440. The last thing you want to do is mix up a batch of water, and then have to start adding components to get it in line with your tank parameters.
Hope this helps!