Ulli Lommel version
Yes, I know this isn't the Ulli Lommel version, however, I want to warn anyone that might think about renting it.
The Ulli Lommel version has not only poor music, cast, acting, and plot, but to top it off, the film likes to flicker between white/black, making you wish you were lucky enough to have a seizure so you could pass out and stop watching it. The acting by far is the worst feature of the film. It won't scare you; it won't excite you; it won't even make you sleepy; it will just bore you. This movie is worse than anything I have ever seen on MST3K, and they have some very low quality movies indeed.
If you value your time and your sanity, warn everyone else you know that the Ulli Lommel version of Black Dahlia is a piece of trash and only serves to tarnish the movie industry as a whole.
Again, I'm sorry for making this a bit of an off-topic thread, but it needs to be said to end the confusion surrounding these two versions; the Ulli Lommel version doesn't have its own page because it's such a poor movie.
Having warned everyone I can, I am off to demand that Ulli Lommel reimburse me for exactly 81 minutes of my life.