I can't find any firm dates (or even vague dates) about when either of those might become available here. “Soon” on a website--the best I can find for Benibachi and more than I can find for BW--could mean anything from next week to never. If you've found something specific, point me to it, please!
If you could I would wait and see if the BW or benibachi soils will be available then (last I heard end of year?) I like ADA aquasoil, its great for plants. But I feel the next step would be specialty shrimp soil.