I will tell you why.
I understand that you may prefer the applied indexes of the Saxonia. But, believe me, the 1815 dial has a true personality with the full railroad and the typical indexes.
Moreover, movement used by the 1815 is really beautiful with its enhanced power reserve and its regulating organ.
And it is a pity to miss a handwind movement with a Lange watch. That's my point of view but a first Lange watch has to be handwind. Don't ask me why but that's my feeling!
The 1815 (platinum):

An alternative option could be the Saxonia Thin which is my fav 2011 novelty:
Applied indexes:
A beautiful movement with visible wheels:
And due to its very sober dial, the Saxonia Thin looks bigger on the wrist:
Hope it helps!
F