Be wary of using ozone. A local reefer I know has turned his on at a lower than maximum "safe" setting & wiped out his tank.
Personally, I prefer UV if it's for polishing your water since light does not stay in the water & harm anything when it returns to the tank. As an Aquacultural Engineer, we used ozone in a commercial hatchery in Powell River, but I don't really see much benefit of using it in a personal tank set up considering the potential harm it can do if something goes wrong. The first sign of trouble may be that all your fish are dead in the morning. Not worth the risk, I think.
JME & O
Anthony