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it's the contents, but more importantly, it's the intent.
A sump's main intent is to add water volume and give you a place to hide the equipment.
A refugium's main intent is to remove nutrients from the water column, by allowing an area for algae to grow that can easily be trimmed.
There are those that swear by refugiums, and those against. I personally think they can potentially help hide a bigger problem with husbandry, therefore *I* choose to not run one. But I strongly encourage you to do the research and see what opinion you come up with.
Good luck, and keep us posted!!
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