What do you mean best? Seems you are set on a sandbed.
My present tank is a 125g and i used Ocean Direct Live Sand. It has a 4 to 6 inch bed in it. I guess i am trying to find a little less expensive way to do the same.
Is there a less expensive way to do the same with 210 gal?
IMO stay away from silica based sand and use crushed aragonite.
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I don't necessarily recommend this, but I use the black sand that you buy at petco. I bought for it's aesthetic quality. I think it's pretty sweet to have black sand and a painted blue background, then have your LEDs emit moonlight. It's tough to see algae, but still recognizable. But I don't think it has any of the beneficial properties like aragonite or crushed coral. I don't know if it's glass or died sand. Someone on here might know more about it's physical properties.
I don't buy the mud thing either. I was just giving some extra info as people lately have the idea that a DSB only has to be 2" deep.