To be fair, I do recall very much liking the final two episodes of the first season of the original Rozen Maiden, which were indeed great episodes for young Jun. I still remember those two episodes pretty well given how it's been at least four years since I watched them.
And the original Rozen Maiden does have at least two significant edges over Zurückspulen:
1. Better action scenes.
2. Detective Kun-Kun.
I honestly found it very adorable and funny how Shinku became such a huge fan of that cartoon character (in her world), to the point of Shinku dressing up as him and playing detective.