Favourite works are most definitely American Vampire, and his run on Detective. I love his DickBats, and Commissioner Gordon interplay, the mood is great, it's one of my favourite Batman stories and may be one of my favourite comics fullstop.
Gates of Gotham I was kind of mixed on, you can definitely tell that it was a precursor to his Court of Owls story, but it's a little rougher and more compressed. Court of Owls breathes a little more and lets you have some more character moments.
The Wake and Severed are both books I've been meaning to pick up for a while but haven't got around to it. Heard good things about both of them.