I like the idea of TV Tropes better, but it suffers from the same overlayering and saturization that most wiki sites do. There are quite a few clever ideas contained therein, but for each of those, there are several that are either redundant, not insightful, or just simply do not apply. And the ratio seems to be getting worse. (You know you're in trouble when there's a section on how tropes apply to fan fiction.)
So I'd say Cracked, who - while it seems to be open to the aspiring writer - apparently has a higher and more consistent standard of content.