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I think the 1815 looks more harmonious, with the subdials a better size than the 5170 which look a little too oversized and too spread out from center. The pushers are also spaced out better from the crown on the 1815. The blued hands are a nice contrast to the ivory/white dial. The pulsation scale is a nice touch.
I am not a huge fan of Breguet numerals too.
As for architecture of the movement, they are pretty similar, but the hand engraved balance cock is definitely a plus and the German silver is a nice hue.
Obviously, from my opinion of the aesthetics, I favor the 1815.
But from a value retention point of view, it's the Patek.
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