I have the Datograph Up/Down and the standard Richard Lange. The Dato is the Dato - the watch that changed the industry with the incredible Cal. L951 - it never gets old and wears proudly. I take your point about the case size of the Richard Lange - but I certainly enjoy the overall heft of the watch. Like you, I've never owned a Zeitwerk - the Date in rose gold would be my choice.
To me, one of the many common threads between these three pieces is the engineering. Three brilliant complications, each bold and at the same time refined - prioritising both form and function. We're all different but I suspect that is one of the principal aspects that draws all of us to Lange and keeps our interest high.