Viking Romantic Danube or Danube Waltz

I'm planning my third Viking cruise for next year and can't decide between Romantic Danube and Danube Waltz. It looks like there's more daylight sailing on RD and more walking around time on DW. Any opinions or suggestions on which to choose?

As you've probably seen, Danube Waltz is more Austria then Slovakia and Budapest. Romantic Danube has those few stops in Germany, less in Austria. It was really hard to decide between them but I picked Romantic Danube for those German stops. I speak a little German and I wanted the experience of seeing (and speaking) in both Germany *and* Austria. I do wish that both of them had more time in Vienna.

We are going on the Romantic Danube cruise in December and wanted to know how long we are in each port. We wanted to do the christmas market cruise and wanted to visit the markets at night time. Does anyone know what times we leave each port? Budapest to Nuremberg