Do some searching on the forums, there's lots of people discussing this. Basically, 2-part is just calcium and alkalinity, and balling is 2-part plus magnesium and trace elements. Most people doing 2-part also add magnesium.
My opinion is that 2-part plus magnesium works for most tanks. Balling is great for SPS corals. I like kalkwasser dosing for tanks with low requirements as it helps keep pH up, and helps lower phosphate (by binding it). It's easy to use and only requires one doser.
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~ Mindy
SPS fanatic.
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