Personally, I would go for the Zeitwerk
It is so different; unique in a good way
The Langematik Perpetual is nice, and the movement is excellent to be sure, but I never have thought Lange nailed it in the design of that piece...it just looks a bit too ordinary
The Zeitwerk on the other hand is extraordinary and is very different from your current Lange pieces
Best of luck whatever you decide
Cheers,
John