I love both dogs AND cats, but I have to admit, cats are easier to care for...:] With cats, you don't need to walk them everyday, you don't need to potty train them, and they are calmer. But don't get me wrong they are both AWESOME pets. x]
Cats because you don't have to take them outside to walk or go to the bathroom or run for exercise, but, cats need their litter scooped, attention, playthings,scratching posts and can damage your furniture if you don't protect it. I can't imagine leaving a cat for a couple of days or a weekend without having somebody to check on them, change the water, scoop the litter box.