If you are looking for the "best/most trusted" then don't use Aquamira liquid since it is not intended for our needs as backpackers. The only liquid solution I know of that is a purifier is what is made by the MSR Miox.

The chlorine dioxide tablets are good. Just ensure that they say they can kill all the nasties. If they are good, they will say that a contact time of up to four hours is required.