Different levels of watchmaking
You have to help yourself decide what you're really looking for.
The DD40 is robust (except for the white gold part), is an icon, is on a bracelet for easy wearing, and is "recognizable".
The Lange has exclusivity (Lange's total production/annum for all watches is around 5,000 units, so you won't see many coming the other way), a unique hand wound movement. Some of the very best finishing in the business. An iconic design. Robust enough for everyday office wear.
If you value the very best, then the choice is clear.
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