It’s impossible beat THE NEVERENDING STORY for me, and DAS BOOT isn’t far behind. Other than that, my knowledge is relatively meager. I think I sampled VIER GEGEN DIE BANK recently, maybe after you mentioned it, Malte. On YouTube, possibly.
I think for me it is DAS BOOT first and then NEVERENDING STORY. Both are his master pieces. Not sure if I mentined VIER GEGEN DIE BANK but that is a nice groovy score and as the majority of Doldinger completely unreleased. More on that when my planned Doldinger filmography article is ready 😉