Hmm, Kuroi Shojo looks like the better of the two based on the synopsis and trailer. Obviously it's a bit early to judge, but that's just my impression so far. I'm not real sure about this project as a whole. Minus the sounds effects, these both seem like two Japanese Horror films that were simply given a Juon prefix to help their sales. They may be good nonetheless though, we'll see. The J-horror well has been pretty dry lately though, with the exception of Noroi: The Curse which I thought was fanstastic.