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Matt Fraction's run on Hawkeye is probably my favorite longtime run of any comic book character. The whole "what if we made a Marvel comic into an indie comic" route working really well with Hawkeye's whole character.

Though in terms of singular, one-off stories, that answer is probably

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In terms of other material? I mean, I kinda grew up with JL and JLU, so they will always have a soft spot in my heart. But the honor of my favorite probably goes to Brave & the Bold for the same reason that I love Adam West Batman, and that's because I'm just a sucker for camp.