Between the two frames pictured, it's a no-brainer for the Duell. Size, condition, tubing. It's a better frame set. 200 Euro's is about $260 USD....... not over-priced at all, IMO.
The big problem here is that you don't like the color on the Duell. If you don't like it now, you're gonna hate it after a few months of riding it.
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"Love is not the dying moan of a distant violin, it’s the triumphant twang of a bedspring."
S. J. Perelman