Selection of a plot in the new development area

You have, which is very unfortunate, unfortunately not yet understood some essential points:

You chose both image sections in such a way that crucial information is cut off – we cannot advise you like this!
Please show the two usage templates; we cannot compare them properly if they are so mutilated.
In the image "bauplatz" knot lines are visible, which are covered by the colorful lines in the image "bauplatz_".
However, these are decisive for where the usage template on the left side of the plan and where the one on the right side applies.
Also, only in the image "bauplatz" – faintly, but at least – contour lines can be seen.

Please indicate for which properties the left and for which the right template applies, and which contour line is closest to the center of the respective property / as well as the neighboring properties on the right/left. Keep in mind ...

... that this is not solely your private decision. Do I have to remind you of my basement formula every month?
(don't forget: this is virtually a "law of nature," I have merely formulated it)

I tried it again in smaller sections and larger (attached).

Ah yes, that makes quite a bit clearer: 1) the difference in the use templates apparently lies only in the fact that only single-family houses are permitted on plots over 500 sqm, and duplexes or smaller below that. 2) mainly plots 6, 7, 15, and 16 (ED) as well as 10 and 11 (E) seem to be attractive.

Thank you very much for the review. We would like to understand why these smaller ones are particularly attractive

I don't understand the question: in what way "smaller" - what sizes do you have in mind?