Thanks for the replies everyone. I've decided to go with the Rolleiflex. I want to shoot medium format and it matches my personal style the best. This might not be true in Germany, but at least in the US people will stop me to ask about the camera. I use this as a chance to ask for their photo and have taken some of my favorites this way.
I'm not too worried about low light. In my experience the leaf shutter makes up for the slightly slower lens. I am also bringing a small table top tripod with a ball head and release cable just in case.
I'm a little nervous to only take one camera, but that's the cost of packing light.