Water Fountain vs. Water Dish for cat?

We use a regular bowl and both our girls seem to be getting enough water. (Litter box cleaning is needed consistently) We make sure to keep fresh water in the dish and clean it out completely about every other day so there's no build up in the bottom.

I've never tried, or considered trying a fountain, although it's always fun to see Internet videos of cats who like to drink at a running faucet, etc.