I am planning my itinerary for a Germany trip sometime in September. Apart from the black Forest region, I am looking to for a 2-3 day base to begin my German leg of the trip and am conflicted between Cologne (from where I was looking to visit Monschau and Aachen) and Hanover (to visit Quedlinburg and Luneburg) - just for context- i love walking around beautiful villages so I narrowed down the aforementioned places and I will be using the excellent German public transport for my travel across Germany.
I have already been to Germany before and visited Heidelberg, Fussen and Tubingen along with Berlin, Munich and Stuttgart.
Would be great if I could get a recommendation on which of the 2 I could look to adding as a base.
thank you in advance for your help