Ozone = molecules of O3, and ozone is ozone no matter how you make it. It is produced in the upper atmosphere by the UV rays of the sun, and by the electrical discharge of lightening. The manufactured ozonator simply mimics one of those two methods.
UV (ultra violet light) seems to have a shorter life span as the bulb ages, while the CD (corona discharge) mimics the effect of lightening as glorified spark pulg, eventually burning out.
I have not used the Aqua Sun Model, but have used 100's of the Del MCD-50 providing great performance. Del's only business is creating ozone and they have been doing it since the 80's. The MCD-50 has replaceable internal components that can be replaced when it ceases operation. This is better than buying a completely new ozonator 4 to 6 years down the road.