What Guy said.

When I had the one in the first pic, I wouldn't use the water on things like jerky and brisket, but did use on ribs and chicken. By the way, put apple juice instead of water and it adds a great flavoring.

I now have the second pit pic version. It's a matter of taste. I you are a serious griller, I would get the second to start off with and Academy has not as good versions as Guy's but ok stuff for about $150.