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Aesthetics play a large role.
They seem to be similar otherwise.

Grey coast calcite is trhe same as onxy also, it's sold in 20lb bags fairl reasonable.
Generally onyx sand is cheaper.

I like the Onyx more, easy to plant stems in, dense, less flow in/out of the substrate vs other products. It's my substrate of choice, flourite next.

I add peat to counter the pH issue and encourage the reduction in the substrate.

This effects wears off as bacterial layers begin to form and stabilize the pH near neutral(this happens in all flooded soils/substrates over time).

Regards,
Tom Barr
 
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