Scott,
It's all personal preference for most people as some brands have higher trace elements or calcium.
After 8yrs of using IO I switched over to Kent because it was mixing up at 400ppm of calcium where as IO was only mixing up to around 320ppm.
There are several reviews out there on salt brands so I would suggest choosing one and sticking with it for a few months before you make any type of conclusion. Also some tanks have reacted poorly to a switch in salts due to the change in parameters. Try searching this board or RC for a detailed look at salt mixes, the article is called the S-15 report.
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