>>213281Neither technique will give you 100% clean water. Your best bet is to filter it with the best filter you can find, boil it for 20 minutes AND purify it.
Considering it can be annoying to do all that and cumbersome to carry, your best option is to have some knowledge of the quality of water of the area you go to, and know what's the most important.
In most of China, a filter will be essential considering the high concentrations of lead and other heavy metals in the water. High in the mountains, water should be good enough only to be boiled for a short time. For most rainwater in the world, purification tabs are enough. In Russia, drink vodka.
Just adapt, but know your water will never be 100% clean. Count on your immune system to do the rest. It's good at it.
