I just finished watching the DC. I enjoyed the TC, but there was something about it that just felt slightly "off." Most of that was fixed with the DC, which restored a lot of good stuff and really fixed some of the pacing issues that kind of plagued the TC.
My favorite additions were probably Rorshach's line about Veidt ("Possible homosexual? Must investigate further."
), and Hollis Mason's death (poor guy) and Dan's reaction to it (Patrick Wilson's performance in this movie is kind of underrated, IMO). I'm still not sure what Zack Snyder was thinking with the choice of music for Dan and Laurie's sex scene. And Nixon's nose is still ridiculous (though that seemed intentional to me).
I kind of wish I had waited until the Ultimate Edition comes out in December, but I'm not sure if meshing Tales of the Black Freighter
into the movie will work as well as it did in the comic. And the movie's already long enough as it is. Maybe I'll rent it.