Both ozone and UV can have benefits to better clarity in your water, but both have dissadvantages also:
1.) Ozone can be quit dangerous to your tank and even to you if not used properly
2.) UV does kill what passes through it clearing your water, but can also kill beneficial stuff also.
I myself am using UV, as it isn't dangerous to me or my family, I only run it for an hour at a time 3 times a day, works very well for me, and I am not really having much of a problem of it also killing my pods, etc.