I have used a few of the salts listed on that site's rank list.
I have used Marine Environment (their hydrometers suck big time. They are calibrated at to low a temperature), Bio-Sea, Coral Marine, Meersaltz (also by Marine Environments), New Ocean,
Red Sea (I am presently using this). Coral Sea, Forty Fathoms/Crystal Sea, Tropic Marin, Instant Ocean (made by Aquarium Systems, owned by Marineland), Kent Salt, Reef Crystals (also an Aquarium Systems product), and Coralife. I have also used the new Oceanic salt that wasn't on the list. It's not bad, disolves quickly and thoroughly leaving no residue. It registers no ammonia after mixing, but only has a carbonate reading of 5.5 dKH and a calcium reading of 320ppm. The salt they have listed as scoring a 100 (Marine Environment), did not impress me much. Yes, it has 73 trace elements, but it leaves a lot of undisolved residue even if I ran a pump to keep it mixing. A little bit of a negative in my book.
Of all of them I have used I like Red Sea, Coralife, and Tropic Marin the best. I haven't been using Oceanic at our store long enough to form any solid opinion on it. If I had a specs sheet on its contents I would get a better idea of it.
All in all, don't put to much faith in that site's ranking system.
What works best in on person's system may not work the best in someone else's system. Try them all and form your own opinion.