I've also never been harmed by a dog, and I have been scratched by a cat on one or two occasions. However, I have been chased around bits of furniture by dogs on occasion as well having had my bike pursued by a little yappy bastard, and those both bothered the crap out of me much more than being scratched by a cat. And quite frankly, cats usually have a good reason (or at the very least are telegraphing very clearly their intention to do so if you don't leave them alone) for scratching/biting people. At least with the domestic ones in my experience.

On relative animal intelligence: agreement in the differing amounts of intelligence, but I like the reactions of kitty minds more - they've always seemed more 'nice' playful to me. Also, what would you rather in your house? A stupid predator whose primary interest is small mammals (smaller than even human infants) or a smart one who has varieties that can easily take down an adult human (noting that no-one sane keeps large cats in their house)? I'm voting for the amusing small cuddly ones.

Also, while trying to remember which variety of dog once chased me around a table I've found the world's freakiest dog photo (photoshop, but still freaky):