Having multiple cats in our household (and multiple dogs) dry food costs less overall and is easier (quicker) to feed and deal with. But I do on occassion give my pets wet food. They tend to think of it almost as a treat.
I respectfully disagree
with those of you who don't see dry as better for their teeth. I still remember, from not too many years ago, this video we watched in a science class in high school. A group of scientists/vets were developing a dry dog food. (I'm sure the logic here would apply to cats.) They said that in the wild when a coyote or wolf eats an animal, the bones from the animal act as a natural toothbrush, scraping food from the teeth, from the gums, etc. They were trying to develope a better dry food to replicate that function, then those on the market at the time the video was made (may have been several years old when I saw it). (Of course, their argument was that theirs was the best.) You could argue that most dry foods would work about the same, but that same being a teeth cleaning, build-up preventing action.
I'm not arguing that cats or dogs don't need us to occassionally brush their teeth or check their gums. I do believe that an all wet diet, may not be as healthy on the teeth and require more maintenance on the part of the owner. (I personally can't see any of our cats letting us brush their teeth.) I also supplement all our animal's diets with treats, chews and toys good for their teeth.