There are 3 varieties of Aquasoil: Africana, Amazonia and Malaya. Each variety is colored to supposedly match the soils that are most commonly found in those regions.
Each variety of Aquasoil comes in 2 forms: Normal and Powder. The only difference between the two is grain size. Powder is a smaller-grained version of normal. Normal Aquasoil is what is most often used.
The great majority of people use Amazonia Normal. I would imagine that's because they prefer the color. Look at your layout and decide which of the three colors would work best. Appearance should be your only consideration when choosing between Africana, Amazonia or Malaya.
There are other ADA substrates but they are sands rather than soils.
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