Cats will sometimes go to great lengths to get to fresh drinking water. I have one who used to insist on scaling her way up onto the bathroom sink to see if the faucet was dripping, even though her bowl was always full. Nowadays, a quality cat water fountain saves her the trouble.
Animals are naturally conditioned to have a preference for running water. Instinctively, they know that this normally means that the water is cleaner and safe to drink. And so cats will naturally be more attracted to drinking out of a cat water fountain than a bowl full of stagnant water.
The water in most models of cat water fountain is actually cleaner, as it's filtered to remove impurities found in tap water in many areas. You'll also find that a good cat water fountain will run quietly and does have a splash guard in place to prevent spillage.
With so many great features included in a quality cat water fountain, all that's left is for you to choose your favorite color and give your favorite feline a present that he'll really enjoy.