Well it depends on how much your willing to spend but I would say for results ADA is 100x better. Plants just grow better in soil lol. Also the powder is for putting on TOP of the normal ADA, not really a substrate of its own, although it can be used that way. Power sand Is basically a volcanic sand with a lot of surface area for bacteria to grow and thrive. If you can get ahold of some at a hardware store or somesuch its a LOT cheaper. Anyway just my 2 cents. And Ive used them both multipul times.