For what it's worth, in my opinion the Dresden Files novels just keep kicking more and more arse. I keep wondering how he'll top himself, and then he does.

The Codex Alera books are pretty good, but they're not as compelling to me as the Dresden ones. (Mostly because, unlike Dresden Files, there's not as much feeling of a rich world around the action; I can imagine many, many other compelling stories in the DF universe. Not so much in Alera.)