I think the safe answer is likely the ceramic diffuser.
Personally, I prefer reactors.
I have seen a device similar (definitely not the same brand) to The Atomizer System at one of the best Live Fish and plant retailers I have ever seen. The device seems to be working well on a number of nano displays they have. It looks suspiciously like other (larger) counter flow reactor devices I have used.
Given the price and apparent clean nature of the system, I would go with The Atomizer System.
Then, of course, want a complete report.
Biollante