this normaly turn into a VERY long thread becasue tehre is so many opinions.
i like and use IO reef crystals. many salts are good for same and bad for others. simply find oen you like and gives you good results and stick with it.
keep this in mind. almost no salt is the exact same all the time. one bucket might give you 300 CA and the next gives you 200. this is more of a problem with the cheaper brands but as long as you test each new batch you make BEFOR adding it to your tank you will be able to compensate.