What kind is the best ozonator?

I am looking at buying an ozonator soon and wonder which of these would be best? I know the corona ozonates the water faster than the stones but what I don't know is if it is a higher quality ozone or if there is such a thing? Or is ozone ozone? And I read on the forum that hydrogen peroxide can increase the need for a liver flushing, will ozonated water do the same thing? Thanks for your time, Caitlin Lorraine

http://shop.toolsforhealing.com/Water_Ozonator_WOZ4_p/st-woz4.htm
http://www.therabreath.com/art_ozonegenerator.asp
http://www.portazoneuv.com/