Travel with Germany

Hello,

I am planning a trip with the family and need some help with the logistics. I am starting my trip in Dortmund to watch a soccer game (heja bvb). Then we will be going to Garmisch-partenkirchen and some time in in Berchtesgaden. We do not have a preference as which destination is first, but we will do both locations. It seems like for those two destinations I would fly into Innsbruck or Salzburg, then drive to our destinations.

Ultimately my question is from Dortmund (Düsseldorf) is it easier to get to Salzburg or Innsbruck?

Anyone have similar travel experiences?? Thank you.