The DCUC line is a very nice line for Batman rogues, but not really a good one to collect especially if you're a late-comer.
Most of them are hard to find, some are almost impossible to find, and the ones you can find on ebay go for extortionate prices.
That aside, they do have a very nice selection of rogues so far, with the prospect of more to come aswell. I think the line only needs a handfull more to beat the BTAS line for the most Batman rogues available.
While the line does have great articulation, to me the face sculpts seem to come off a bit cold and emotionless. I also think the re-use of bodies isn't suited to some of the characters and the neckline on Batman looks a little odd.
At least with DCD, what they lack in articulation, they make up for in expressive sculpts and for the most part unique bodies too.
I think if I were new to collecting Batman, and I wanted a line with all the rogues in, I'd have to choose the DCD route out of these two.