I prefer to catch them and put them outside rather than killing them if at all possible. Or, rather, have someone else do it since I'm a wuss. Of course, there aren't really any super-dangerous spiders/insects around here... but they still creep me out. Luckily, I live in a third-floor apartment right now so they rarely ever make it up here, but on the rare occasions when they do I'm fine with letting them live as long as they can do so away from me.