Water is one of those things we barely think about until something is wrong with it. When it comes out of the tap looking clear, smelling normal, and tasting clean, you simply drink it and move on with your day. But the moment the water looks cloudy, smells strange, or has something floating in it, suddenly drinking a glass of water becomes a much more complicated decision. Clean water is better for the incredibly simple reason that water is supposed to hydrate you, not make you wonder what microscopic civilization might currently be living inside your glass.
Clean water is also obviously better for your health. Contaminated water can contain harmful bacteria, parasites, chemicals, and other pollutants that can cause illness. Humans have spent thousands of years developing better ways to find, transport, filter, disinfect, and distribute clean water because having a reliable supply of safe drinking water makes an enormous difference to public health. Something as ordinary as filling a glass from the tap would have seemed like an unbelievable luxury to many people throughout history.
There is also the simple matter of taste. Good water barely tastes like anything, and that is exactly what makes it good. Water should be refreshing. It should disappear into the background. You should not finish a glass and immediately start analyzing the mysterious metallic aftertaste. Clean water does its job without demanding your attention.
And that might be the best thing about it. Clean water is boring in the best possible way. You drink it, you cook with it, you wash with it, and you rarely have to think about whether it is safe. Dirty water turns one of the most basic necessities of life into a problem that needs to be solved. So yes, after an unnecessarily detailed investigation, we can confidently reach the groundbreaking conclusion that clean water is indeed better than dirty water.