You need to dose for almost every salt if the system needs to be dosed. If a system needs to be dosed with IO, it will need to be dosed with salinity, h2ocean and every brand of salt. Its just that, with IO for example, you will have to dose the initial water mix to bring up the parameters.
Many reefers use IO with success. That's one brand of salt which cannot be argued above. Rest of the brands are just personal preferences. I have used salinity and I was happy with one batch but unhappy with other. They are notoriously famous for being inconsistent from batches to batches. Among the high end salts, reefers best and H2ocean seems to be the most consistent ones.
Like I said, in the end, its just personal preference. If you tank has a high intake of elements, you will have to dose.
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob
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