Personally I like the DD better. I don't have the longies pattern for the Ladybugz, but I do have the soaker pattern. I guess you are talking about the longies patterns? The DD pattern is sc which in my experience makes it more bullet proof (Ladybugz is hdc). The fitted bum is nice on the Ladybugz, but to me it is limiting. I can't figure out how I could do stripes with the fitted bum (if you get the pattern you will know what I mean, it is hard to describe), but that is not the case with the DD pattern. With the DD pattern you can add short rows and a crotch gusset to add a little extra room and I have never had a problem with them fitting.
As far as the soaker patterns go, the Ladybugz fit over a prefold better, but I guess you could just make the ribbing on the leg opening of the DD longer to make them fit better. I really don't make soakers anymore as I just dress my children in longies or shorties.
Also, Patti from DD is very helpful and has always answered all of my questions promptly and understandably.
hth,
Beth